diff --git a/Gruntfile.js b/Gruntfile.js
index 9a35f61e79496..c925a4f567227 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -659,9 +659,7 @@ module.exports = function(grunt) {
 					src: [
 						'**/*',
 						'!**/*.map',
-						// Skip non-minified VIPS files — they are ~16MB of inlined WASM
-						// with no debugging value over the minified versions.
-						'!vips/!(*.min).js',
+						'!vips/**',
 					],
 					dest: WORKING_DIR + 'wp-includes/js/dist/script-modules/',
 				} ],
diff --git a/src/wp-includes/default-filters.php b/src/wp-includes/default-filters.php
index a1c2e4d93df87..4b6d9de25fa11 100644
--- a/src/wp-includes/default-filters.php
+++ b/src/wp-includes/default-filters.php
@@ -678,13 +678,6 @@
 add_action( 'plugins_loaded', '_wp_add_additional_image_sizes', 0 );
 add_filter( 'plupload_default_settings', 'wp_show_heic_upload_error' );
 
-// Client-side media processing.
-add_action( 'admin_init', 'wp_set_client_side_media_processing_flag' );
-// Cross-origin isolation for client-side media processing.
-add_action( 'load-post.php', 'wp_set_up_cross_origin_isolation' );
-add_action( 'load-post-new.php', 'wp_set_up_cross_origin_isolation' );
-add_action( 'load-site-editor.php', 'wp_set_up_cross_origin_isolation' );
-add_action( 'load-widgets.php', 'wp_set_up_cross_origin_isolation' );
 // Nav menu.
 add_filter( 'nav_menu_item_id', '_nav_menu_item_id_use_once', 10, 2 );
 add_filter( 'nav_menu_css_class', 'wp_nav_menu_remove_menu_item_has_children_class', 10, 4 );
diff --git a/src/wp-includes/media-template.php b/src/wp-includes/media-template.php
index bc887bafd1197..5fb6b5d894d9b 100644
--- a/src/wp-includes/media-template.php
+++ b/src/wp-includes/media-template.php
@@ -156,12 +156,6 @@ class="wp-video-shortcode {{ classes.join( ' ' ) }}"
 function wp_print_media_templates() {
 	$class = 'media-modal wp-core-ui';
 
-	$is_cross_origin_isolation_enabled = wp_is_client_side_media_processing_enabled();
-
-	if ( $is_cross_origin_isolation_enabled ) {
-		ob_start();
-	}
-
 	$alt_text_description = sprintf(
 		/* translators: 1: Link to tutorial, 2: Additional link attributes, 3: Accessibility text. */
 		__( '<a href="%1$s" %2$s>Learn how to describe the purpose of the image%3$s</a>. Leave empty if the image is purely decorative.' ),
@@ -1588,42 +1582,4 @@ function wp_print_media_templates() {
 	 * @since 3.5.0
 	 */
 	do_action( 'print_media_templates' );
-
-	if ( $is_cross_origin_isolation_enabled ) {
-		$html = (string) ob_get_clean();
-
-		/*
-		 * The media templates are inside <script type="text/html"> tags,
-		 * whose content is treated as raw text by the HTML Tag Processor.
-		 * Extract each script block's content, process it separately,
-		 * then reassemble the full output.
-		 */
-		$script_processor = new WP_HTML_Tag_Processor( $html );
-		while ( $script_processor->next_tag( 'SCRIPT' ) ) {
-			if ( 'text/html' !== $script_processor->get_attribute( 'type' ) ) {
-				continue;
-			}
-			/*
-			 * Unlike wp_add_crossorigin_attributes(), this does not check whether
-			 * URLs are actually cross-origin. Media templates use Underscore.js
-			 * template expressions (e.g. {{ data.url }}) as placeholder URLs,
-			 * so actual URLs are not available at parse time.
-			 * The crossorigin attribute is added unconditionally to all relevant
-			 * media tags to ensure cross-origin isolation works regardless of
-			 * the final URL value at render time.
-			 */
-			$template_processor = new WP_HTML_Tag_Processor( $script_processor->get_modifiable_text() );
-			while ( $template_processor->next_tag() ) {
-				if (
-					in_array( $template_processor->get_tag(), array( 'AUDIO', 'IMG', 'VIDEO' ), true )
-					&& ! is_string( $template_processor->get_attribute( 'crossorigin' ) )
-				) {
-					$template_processor->set_attribute( 'crossorigin', 'anonymous' );
-				}
-			}
-			$script_processor->set_modifiable_text( $template_processor->get_updated_html() );
-		}
-
-		echo $script_processor->get_updated_html();
-	}
 }
diff --git a/src/wp-includes/media.php b/src/wp-includes/media.php
index 9bf36efae81f9..7ff250413ad2b 100644
--- a/src/wp-includes/media.php
+++ b/src/wp-includes/media.php
@@ -6400,234 +6400,3 @@ function wp_get_image_editor_output_format( $filename, $mime_type ) {
 	return apply_filters( 'image_editor_output_format', $output_format, $filename, $mime_type );
 }
 
-/**
- * Checks whether client-side media processing is enabled.
- *
- * Client-side media processing uses the browser's capabilities to handle
- * tasks like image resizing and compression before uploading to the server.
- *
- * @since 7.0.0
- *
- * @return bool Whether client-side media processing is enabled.
- */
-function wp_is_client_side_media_processing_enabled(): bool {
-	// This is due to SharedArrayBuffer requiring a secure context.
-	$host    = strtolower( (string) strtok( $_SERVER['HTTP_HOST'] ?? '', ':' ) );
-	$enabled = ( is_ssl() || 'localhost' === $host || str_ends_with( $host, '.localhost' ) );
-
-	/**
-	 * Filters whether client-side media processing is enabled.
-	 *
-	 * @since 7.0.0
-	 *
-	 * @param bool $enabled Whether client-side media processing is enabled. Default true if the page is served in a secure context.
-	 */
-	return (bool) apply_filters( 'wp_client_side_media_processing_enabled', $enabled );
-}
-
-/**
- * Sets a global JS variable to indicate that client-side media processing is enabled.
- *
- * @since 7.0.0
- */
-function wp_set_client_side_media_processing_flag(): void {
-	if ( ! wp_is_client_side_media_processing_enabled() ) {
-		return;
-	}
-
-	wp_add_inline_script( 'wp-block-editor', 'window.__clientSideMediaProcessing = true;', 'before' );
-
-	$chromium_version = wp_get_chromium_major_version();
-
-	if ( null !== $chromium_version && $chromium_version >= 137 ) {
-		wp_add_inline_script( 'wp-block-editor', 'window.__documentIsolationPolicy = true;', 'before' );
-	}
-
-	/*
-	 * Register the @wordpress/vips/worker script module as a dynamic dependency
-	 * of the wp-upload-media classic script. This ensures it is included in the
-	 * import map so that the dynamic import() in upload-media.js can resolve it.
-	 */
-	wp_scripts()->add_data(
-		'wp-upload-media',
-		'module_dependencies',
-		array( '@wordpress/vips/worker' )
-	);
-}
-
-/**
- * Returns the major Chrome/Chromium version from the current request's User-Agent.
- *
- * Matches all Chromium-based browsers (Chrome, Edge, Opera, Brave).
- *
- * @since 7.0.0
- *
- * @return int|null The major Chrome version, or null if not a Chromium browser.
- */
-function wp_get_chromium_major_version(): ?int {
-	if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
-		return null;
-	}
-	if ( preg_match( '#Chrome/(\d+)#', $_SERVER['HTTP_USER_AGENT'], $matches ) ) {
-		return (int) $matches[1];
-	}
-	return null;
-}
-
-/**
- * Enables cross-origin isolation in the block editor.
- *
- * Required for enabling SharedArrayBuffer for WebAssembly-based
- * media processing in the editor. Uses Document-Isolation-Policy
- * on supported browsers (Chromium 137+).
- *
- * Skips setup when a third-party page builder overrides the block
- * editor via a custom `action` query parameter, as DIP would block
- * same-origin iframe access that these editors rely on.
- *
- * @since 7.0.0
- */
-function wp_set_up_cross_origin_isolation(): void {
-	if ( ! wp_is_client_side_media_processing_enabled() ) {
-		return;
-	}
-
-	$screen = get_current_screen();
-
-	if ( ! $screen ) {
-		return;
-	}
-
-	if ( ! $screen->is_block_editor() && 'site-editor' !== $screen->id && ! ( 'widgets' === $screen->id && wp_use_widgets_block_editor() ) ) {
-		return;
-	}
-
-	/*
-	 * Skip when a third-party page builder overrides the block editor.
-	 * DIP isolates the document into its own agent cluster,
-	 * which blocks same-origin iframe access that these editors rely on.
-	 */
-	if ( isset( $_GET['action'] ) && 'edit' !== $_GET['action'] ) {
-		return;
-	}
-
-	// Cross-origin isolation is not needed if users can't upload files anyway.
-	if ( ! current_user_can( 'upload_files' ) ) {
-		return;
-	}
-
-	wp_start_cross_origin_isolation_output_buffer();
-}
-
-/**
- * Sends the Document-Isolation-Policy header for cross-origin isolation.
- *
- * Uses an output buffer to add crossorigin="anonymous" where needed.
- *
- * @since 7.0.0
- */
-function wp_start_cross_origin_isolation_output_buffer(): void {
-	$chromium_version = wp_get_chromium_major_version();
-
-	if ( null === $chromium_version || $chromium_version < 137 ) {
-		return;
-	}
-
-	ob_start(
-		static function ( string $output ): string {
-			header( 'Document-Isolation-Policy: isolate-and-credentialless' );
-
-			return wp_add_crossorigin_attributes( $output );
-		}
-	);
-}
-
-/**
- * Adds crossorigin="anonymous" to relevant tags in the given HTML string.
- *
- * @since 7.0.0
- *
- * @param string $html HTML input.
- * @return string Modified HTML.
- */
-function wp_add_crossorigin_attributes( string $html ): string {
-	$site_url = site_url();
-
-	$processor = new WP_HTML_Tag_Processor( $html );
-
-	// See https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/crossorigin.
-	$cross_origin_tag_attributes = array(
-		'AUDIO'  => array( 'src' => false ),
-		'LINK'   => array( 'href' => false ),
-		'SCRIPT' => array( 'src' => false ),
-		'VIDEO'  => array(
-			'src'    => false,
-			'poster' => false,
-		),
-		'SOURCE' => array( 'src' => false ),
-	);
-
-	while ( $processor->next_tag() ) {
-		$tag = $processor->get_tag();
-
-		if ( ! isset( $cross_origin_tag_attributes[ $tag ] ) ) {
-			continue;
-		}
-
-		if ( 'AUDIO' === $tag || 'VIDEO' === $tag ) {
-			$processor->set_bookmark( 'audio-video-parent' );
-		}
-
-		$processor->set_bookmark( 'resume' );
-
-		$sought = false;
-
-		$crossorigin = $processor->get_attribute( 'crossorigin' );
-
-		$is_cross_origin = false;
-
-		foreach ( $cross_origin_tag_attributes[ $tag ] as $attr => $is_srcset ) {
-			if ( $is_srcset ) {
-				$srcset = $processor->get_attribute( $attr );
-				if ( is_string( $srcset ) ) {
-					foreach ( explode( ',', $srcset ) as $candidate ) {
-						$candidate_url = strtok( trim( $candidate ), ' ' );
-						if ( is_string( $candidate_url ) && '' !== $candidate_url && ! str_starts_with( $candidate_url, $site_url ) && ! str_starts_with( $candidate_url, '/' ) ) {
-							$is_cross_origin = true;
-							break;
-						}
-					}
-				}
-			} else {
-				$url = $processor->get_attribute( $attr );
-				if ( is_string( $url ) && ! str_starts_with( $url, $site_url ) && ! str_starts_with( $url, '/' ) ) {
-					$is_cross_origin = true;
-				}
-			}
-
-			if ( $is_cross_origin ) {
-				break;
-			}
-		}
-
-		if ( $is_cross_origin && ! is_string( $crossorigin ) ) {
-			if ( 'SOURCE' === $tag ) {
-				$sought = $processor->seek( 'audio-video-parent' );
-
-				if ( $sought ) {
-					$processor->set_attribute( 'crossorigin', 'anonymous' );
-				}
-			} else {
-				$processor->set_attribute( 'crossorigin', 'anonymous' );
-			}
-
-			if ( $sought ) {
-				$processor->seek( 'resume' );
-				$processor->release_bookmark( 'audio-video-parent' );
-			}
-		}
-	}
-
-	return $processor->get_updated_html();
-}
-
diff --git a/src/wp-includes/rest-api/class-wp-rest-server.php b/src/wp-includes/rest-api/class-wp-rest-server.php
index 704a990298826..dbf605523d2dc 100644
--- a/src/wp-includes/rest-api/class-wp-rest-server.php
+++ b/src/wp-includes/rest-api/class-wp-rest-server.php
@@ -1368,34 +1368,6 @@ public function get_index( $request ) {
 			'routes'          => $this->get_data_for_routes( $this->get_routes(), $request['context'] ),
 		);
 
-		// Add media processing settings for users who can upload files.
-		if ( wp_is_client_side_media_processing_enabled() && current_user_can( 'upload_files' ) ) {
-			// Image sizes keyed by name for client-side media processing.
-			$available['image_sizes'] = array();
-			foreach ( wp_get_registered_image_subsizes() as $name => $size ) {
-				$available['image_sizes'][ $name ] = $size;
-			}
-
-			/** This filter is documented in wp-admin/includes/image.php */
-			$available['image_size_threshold'] = (int) apply_filters( 'big_image_size_threshold', 2560, array( 0, 0 ), '', 0 );
-
-			// Image output formats.
-			$input_formats  = array( 'image/jpeg', 'image/png', 'image/gif', 'image/webp', 'image/avif', 'image/heic' );
-			$output_formats = array();
-			foreach ( $input_formats as $mime_type ) {
-				/** This filter is documented in wp-includes/media.php */
-				$output_formats = apply_filters( 'image_editor_output_format', $output_formats, '', $mime_type );
-			}
-			$available['image_output_formats'] = (object) $output_formats;
-
-			/** This filter is documented in wp-includes/class-wp-image-editor-gd.php */
-			$available['jpeg_interlaced'] = (bool) apply_filters( 'image_save_progressive', false, 'image/jpeg' );
-			/** This filter is documented in wp-includes/class-wp-image-editor-gd.php */
-			$available['png_interlaced'] = (bool) apply_filters( 'image_save_progressive', false, 'image/png' );
-			/** This filter is documented in wp-includes/class-wp-image-editor-gd.php */
-			$available['gif_interlaced'] = (bool) apply_filters( 'image_save_progressive', false, 'image/gif' );
-		}
-
 		$response = new WP_REST_Response( $available );
 
 		$fields = $request['_fields'] ?? '';
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
index cb714d5a5de71..7b207938412f8 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
@@ -63,97 +63,6 @@ public function register_routes() {
 				'args'                => $this->get_edit_media_item_args(),
 			)
 		);
-
-		if ( wp_is_client_side_media_processing_enabled() ) {
-			$valid_image_sizes = array_keys( wp_get_registered_image_subsizes() );
-			// Special case to set 'original_image' in attachment metadata.
-			$valid_image_sizes[] = 'original';
-			// Used for PDF thumbnails.
-			$valid_image_sizes[] = 'full';
-			// Client-side big image threshold: sideload the scaled version.
-			$valid_image_sizes[] = 'scaled';
-
-			register_rest_route(
-				$this->namespace,
-				'/' . $this->rest_base . '/(?P<id>[\d]+)/sideload',
-				array(
-					array(
-						'methods'             => WP_REST_Server::CREATABLE,
-						'callback'            => array( $this, 'sideload_item' ),
-						'permission_callback' => array( $this, 'sideload_item_permissions_check' ),
-						'args'                => array(
-							'id'             => array(
-								'description' => __( 'Unique identifier for the attachment.' ),
-								'type'        => 'integer',
-							),
-							'image_size'     => array(
-								'description' => __( 'Image size.' ),
-								'type'        => 'string',
-								'enum'        => $valid_image_sizes,
-								'required'    => true,
-							),
-							'convert_format' => array(
-								'type'        => 'boolean',
-								'default'     => true,
-								'description' => __( 'Whether to convert image formats.' ),
-							),
-						),
-					),
-					'allow_batch' => $this->allow_batch,
-					'schema'      => array( $this, 'get_public_item_schema' ),
-				)
-			);
-
-			register_rest_route(
-				$this->namespace,
-				'/' . $this->rest_base . '/(?P<id>[\d]+)/finalize',
-				array(
-					array(
-						'methods'             => WP_REST_Server::CREATABLE,
-						'callback'            => array( $this, 'finalize_item' ),
-						'permission_callback' => array( $this, 'edit_media_item_permissions_check' ),
-						'args'                => array(
-							'id' => array(
-								'description' => __( 'Unique identifier for the attachment.' ),
-								'type'        => 'integer',
-							),
-						),
-					),
-					'allow_batch' => $this->allow_batch,
-					'schema'      => array( $this, 'get_public_item_schema' ),
-				)
-			);
-		}
-	}
-
-	/**
-	 * Retrieves the query params for the attachments collection.
-	 *
-	 * @since 7.0.0
-	 *
-	 * @param string $method Optional. HTTP method of the request.
-	 *                       The arguments for `CREATABLE` requests are
-	 *                       checked for required values and may fall-back to a given default.
-	 *                       Default WP_REST_Server::CREATABLE.
-	 * @return array<string, array<string, mixed>> Endpoint arguments.
-	 */
-	public function get_endpoint_args_for_item_schema( $method = WP_REST_Server::CREATABLE ) {
-		$args = parent::get_endpoint_args_for_item_schema( $method );
-
-		if ( WP_REST_Server::CREATABLE === $method && wp_is_client_side_media_processing_enabled() ) {
-			$args['generate_sub_sizes'] = array(
-				'type'        => 'boolean',
-				'default'     => true,
-				'description' => __( 'Whether to generate image sub sizes.' ),
-			);
-			$args['convert_format']     = array(
-				'type'        => 'boolean',
-				'default'     => true,
-				'description' => __( 'Whether to convert image formats.' ),
-			);
-		}
-
-		return $args;
 	}
 
 	/**
@@ -252,12 +161,6 @@ public function create_item_permissions_check( $request ) {
 		 */
 		$prevent_unsupported_uploads = apply_filters( 'wp_prevent_unsupported_mime_type_uploads', true, $files['file']['type'] ?? null );
 
-		// When the client handles image processing (generate_sub_sizes is false),
-		// skip the server-side image editor support check.
-		if ( false === $request['generate_sub_sizes'] ) {
-			$prevent_unsupported_uploads = false;
-		}
-
 		// If the upload is an image, check if the server can handle the mime type.
 		if (
 			$prevent_unsupported_uploads &&
@@ -289,7 +192,6 @@ public function create_item_permissions_check( $request ) {
 	 * Creates a single attachment.
 	 *
 	 * @since 4.7.0
-	 * @since 7.0.0 Added `generate_sub_sizes` and `convert_format` parameters.
 	 *
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return WP_REST_Response|WP_Error Response object on success, WP_Error object on failure.
@@ -303,24 +205,9 @@ public function create_item( $request ) {
 			);
 		}
 
-		// Handle generate_sub_sizes parameter.
-		if ( false === $request['generate_sub_sizes'] ) {
-			add_filter( 'intermediate_image_sizes_advanced', '__return_empty_array', 100 );
-			add_filter( 'fallback_intermediate_image_sizes', '__return_empty_array', 100 );
-			// Disable server-side EXIF rotation so the client can handle it.
-			// This preserves the original orientation value in the metadata.
-			add_filter( 'wp_image_maybe_exif_rotate', '__return_false', 100 );
-		}
-
-		// Handle convert_format parameter.
-		if ( isset( $request['convert_format'] ) && ! $request['convert_format'] ) {
-			add_filter( 'image_editor_output_format', '__return_empty_array', 100 );
-		}
-
 		$insert = $this->insert_attachment( $request );
 
 		if ( is_wp_error( $insert ) ) {
-			$this->remove_client_side_media_processing_filters();
 			return $insert;
 		}
 
@@ -338,7 +225,6 @@ public function create_item( $request ) {
 			$thumbnail_update = $this->handle_featured_media( $request['featured_media'], $attachment_id );
 
 			if ( is_wp_error( $thumbnail_update ) ) {
-				$this->remove_client_side_media_processing_filters();
 				return $thumbnail_update;
 			}
 		}
@@ -347,7 +233,6 @@ public function create_item( $request ) {
 			$meta_update = $this->meta->update_value( $request['meta'], $attachment_id );
 
 			if ( is_wp_error( $meta_update ) ) {
-				$this->remove_client_side_media_processing_filters();
 				return $meta_update;
 			}
 		}
@@ -356,14 +241,12 @@ public function create_item( $request ) {
 		$fields_update = $this->update_additional_fields_for_object( $attachment, $request );
 
 		if ( is_wp_error( $fields_update ) ) {
-			$this->remove_client_side_media_processing_filters();
 			return $fields_update;
 		}
 
 		$terms_update = $this->handle_terms( $attachment_id, $request );
 
 		if ( is_wp_error( $terms_update ) ) {
-			$this->remove_client_side_media_processing_filters();
 			return $terms_update;
 		}
 
@@ -400,8 +283,6 @@ public function create_item( $request ) {
 		 */
 		wp_update_attachment_metadata( $attachment_id, wp_generate_attachment_metadata( $attachment_id, $file ) );
 
-		$this->remove_client_side_media_processing_filters();
-
 		$response = $this->prepare_item_for_response( $attachment, $request );
 		$response = rest_ensure_response( $response );
 		$response->set_status( 201 );
@@ -410,18 +291,6 @@ public function create_item( $request ) {
 		return $response;
 	}
 
-	/**
-	 * Removes filters added for client-side media processing.
-	 *
-	 * @since 7.0.0
-	 */
-	private function remove_client_side_media_processing_filters() {
-		remove_filter( 'intermediate_image_sizes_advanced', '__return_empty_array', 100 );
-		remove_filter( 'fallback_intermediate_image_sizes', '__return_empty_array', 100 );
-		remove_filter( 'wp_image_maybe_exif_rotate', '__return_false', 100 );
-		remove_filter( 'image_editor_output_format', '__return_empty_array', 100 );
-	}
-
 	/**
 	 * Inserts the attachment post in the database. Does not update the attachment meta.
 	 *
@@ -1987,272 +1856,4 @@ protected function get_attachment_filesize( int $attachment_id ): ?int {
 
 		return null;
 	}
-
-	/**
-	 * Checks if a given request has access to sideload a file.
-	 *
-	 * Sideloading a file for an existing attachment
-	 * requires both update and create permissions.
-	 *
-	 * @since 7.0.0
-	 *
-	 * @param WP_REST_Request $request Full details about the request.
-	 * @return true|WP_Error True if the request has access to update the item, WP_Error object otherwise.
-	 */
-	public function sideload_item_permissions_check( $request ) {
-		return $this->edit_media_item_permissions_check( $request );
-	}
-
-	/**
-	 * Side-loads a media file without creating a new attachment.
-	 *
-	 * @since 7.0.0
-	 *
-	 * @param WP_REST_Request $request Full details about the request.
-	 * @return WP_REST_Response|WP_Error Response object on success, WP_Error object on failure.
-	 */
-	public function sideload_item( WP_REST_Request $request ) {
-		$attachment_id = $request['id'];
-
-		$post = $this->get_post( $attachment_id );
-
-		if ( is_wp_error( $post ) ) {
-			return $post;
-		}
-
-		if (
-			! wp_attachment_is_image( $post ) &&
-			! wp_attachment_is( 'pdf', $post )
-		) {
-			return new WP_Error(
-				'rest_post_invalid_id',
-				__( 'Invalid post ID. Only images and PDFs can be sideloaded.' ),
-				array( 'status' => 400 )
-			);
-		}
-
-		if ( isset( $request['convert_format'] ) && ! $request['convert_format'] ) {
-			// Prevent image conversion as that is done client-side.
-			add_filter( 'image_editor_output_format', '__return_empty_array', 100 );
-		}
-
-		// Get the file via $_FILES or raw data.
-		$files   = $request->get_file_params();
-		$headers = $request->get_headers();
-
-		/*
-		 * wp_unique_filename() will always add numeric suffix if the name looks like a sub-size to avoid conflicts.
-		 * See /wp-includes/functions.php.
-		 * With the following filter we can work around this safeguard.
-		 */
-		$attachment_filename = get_attached_file( $attachment_id, true );
-		$attachment_filename = $attachment_filename ? wp_basename( $attachment_filename ) : null;
-
-		$filter_filename = static function ( $filename, $ext, $dir, $unique_filename_callback, $alt_filenames, $number ) use ( $attachment_filename ) {
-			return self::filter_wp_unique_filename( $filename, $dir, $number, $attachment_filename );
-		};
-
-		add_filter( 'wp_unique_filename', $filter_filename, 10, 6 );
-
-		$parent_post = get_post_parent( $attachment_id );
-
-		$time = null;
-
-		// Matches logic in media_handle_upload().
-		// The post date doesn't usually matter for pages, so don't backdate this upload.
-		if ( $parent_post && 'page' !== $parent_post->post_type && ! str_starts_with( $parent_post->post_date, '0000-00-00' ) ) {
-			$time = $parent_post->post_date;
-		}
-
-		if ( ! empty( $files ) ) {
-			$file = $this->upload_from_file( $files, $headers, $time );
-		} else {
-			$file = $this->upload_from_data( $request->get_body(), $headers, $time );
-		}
-
-		remove_filter( 'wp_unique_filename', $filter_filename );
-		remove_filter( 'image_editor_output_format', '__return_empty_array', 100 );
-
-		if ( is_wp_error( $file ) ) {
-			return $file;
-		}
-
-		$type = $file['type'];
-		$path = $file['file'];
-
-		$image_size = $request['image_size'];
-
-		$metadata = wp_get_attachment_metadata( $attachment_id, true );
-
-		if ( ! $metadata ) {
-			$metadata = array();
-		}
-
-		if ( 'original' === $image_size ) {
-			$metadata['original_image'] = wp_basename( $path );
-		} elseif ( 'scaled' === $image_size ) {
-			// The current attached file is the original; record it as original_image.
-			$current_file = get_attached_file( $attachment_id, true );
-
-			if ( ! $current_file ) {
-				return new WP_Error(
-					'rest_sideload_no_attached_file',
-					__( 'Unable to retrieve the attached file for this attachment.' ),
-					array( 'status' => 404 )
-				);
-			}
-
-			$metadata['original_image'] = wp_basename( $current_file );
-
-			// Validate the scaled image before updating the attached file.
-			$size     = wp_getimagesize( $path );
-			$filesize = wp_filesize( $path );
-
-			if ( ! $size || ! $filesize ) {
-				return new WP_Error(
-					'rest_sideload_invalid_image',
-					__( 'Unable to read the scaled image file.' ),
-					array( 'status' => 500 )
-				);
-			}
-
-			// Update the attached file to point to the scaled version.
-			if (
-				get_attached_file( $attachment_id, true ) !== $path &&
-				! update_attached_file( $attachment_id, $path )
-			) {
-				return new WP_Error(
-					'rest_sideload_update_attached_file_failed',
-					__( 'Unable to update the attached file for this attachment.' ),
-					array( 'status' => 500 )
-				);
-			}
-
-			$metadata['width']    = $size[0];
-			$metadata['height']   = $size[1];
-			$metadata['filesize'] = $filesize;
-			$metadata['file']     = _wp_relative_upload_path( $path );
-		} else {
-			$metadata['sizes'] = $metadata['sizes'] ?? array();
-
-			$size = wp_getimagesize( $path );
-
-			$metadata['sizes'][ $image_size ] = array(
-				'width'     => $size ? $size[0] : 0,
-				'height'    => $size ? $size[1] : 0,
-				'file'      => wp_basename( $path ),
-				'mime-type' => $type,
-				'filesize'  => wp_filesize( $path ),
-			);
-		}
-
-		wp_update_attachment_metadata( $attachment_id, $metadata );
-
-		$response_request = new WP_REST_Request(
-			WP_REST_Server::READABLE,
-			rest_get_route_for_post( $attachment_id )
-		);
-
-		$response_request['context'] = 'edit';
-
-		if ( isset( $request['_fields'] ) ) {
-			$response_request['_fields'] = $request['_fields'];
-		}
-
-		$response = $this->prepare_item_for_response( get_post( $attachment_id ), $response_request );
-
-		$response->header( 'Location', rest_url( rest_get_route_for_post( $attachment_id ) ) );
-
-		return $response;
-	}
-
-	/**
-	 * Filters wp_unique_filename during sideloads.
-	 *
-	 * wp_unique_filename() will always add numeric suffix if the name looks like a sub-size to avoid conflicts.
-	 * Adding this closure to the filter helps work around this safeguard.
-	 *
-	 * Example: when uploading myphoto.jpeg, WordPress normally creates myphoto-150x150.jpeg,
-	 * and when uploading myphoto-150x150.jpeg, it will be renamed to myphoto-150x150-1.jpeg
-	 * However, here it is desired not to add the suffix in order to maintain the same
-	 * naming convention as if the file was uploaded regularly.
-	 *
-	 * @since 7.0.0
-	 *
-	 * @link https://github.com/WordPress/wordpress-develop/blob/30954f7ac0840cfdad464928021d7f380940c347/src/wp-includes/functions.php#L2576-L2582
-	 *
-	 * @param string      $filename            Unique file name.
-	 * @param string      $dir                 Directory path.
-	 * @param int|string  $number              The highest number that was used to make the file name unique
-	 *                                         or an empty string if unused.
-	 * @param string|null $attachment_filename Original attachment file name.
-	 * @return string Filtered file name.
-	 */
-	private static function filter_wp_unique_filename( $filename, $dir, $number, $attachment_filename ) {
-		if ( ! is_int( $number ) || ! $attachment_filename ) {
-			return $filename;
-		}
-
-		$ext       = pathinfo( $filename, PATHINFO_EXTENSION );
-		$name      = pathinfo( $filename, PATHINFO_FILENAME );
-		$orig_name = pathinfo( $attachment_filename, PATHINFO_FILENAME );
-
-		if ( ! $ext || ! $name ) {
-			return $filename;
-		}
-
-		$matches = array();
-		if ( preg_match( '/(.*)-(\d+x\d+|scaled)-' . $number . '$/', $name, $matches ) ) {
-			$filename_without_suffix = $matches[1] . '-' . $matches[2] . ".$ext";
-			if ( $matches[1] === $orig_name && ! file_exists( "$dir/$filename_without_suffix" ) ) {
-				return $filename_without_suffix;
-			}
-		}
-
-		return $filename;
-	}
-
-	/**
-	 * Finalizes an attachment after client-side media processing.
-	 *
-	 * Triggers the 'wp_generate_attachment_metadata' filter so that
-	 * server-side plugins can process the attachment after all client-side
-	 * operations (upload, thumbnail generation, sideloads) are complete.
-	 *
-	 * @since 7.0.0
-	 *
-	 * @param WP_REST_Request $request Full details about the request.
-	 * @return WP_REST_Response|WP_Error Response object on success, WP_Error object on failure.
-	 */
-	public function finalize_item( WP_REST_Request $request ) {
-		$attachment_id = $request['id'];
-
-		$post = $this->get_post( $attachment_id );
-		if ( is_wp_error( $post ) ) {
-			return $post;
-		}
-
-		$metadata = wp_get_attachment_metadata( $attachment_id );
-		if ( ! is_array( $metadata ) ) {
-			$metadata = array();
-		}
-
-		/** This filter is documented in wp-admin/includes/image.php */
-		$metadata = apply_filters( 'wp_generate_attachment_metadata', $metadata, $attachment_id, 'update' );
-
-		wp_update_attachment_metadata( $attachment_id, $metadata );
-
-		$response_request = new WP_REST_Request(
-			WP_REST_Server::READABLE,
-			rest_get_route_for_post( $attachment_id )
-		);
-
-		$response_request['context'] = 'edit';
-
-		if ( isset( $request['_fields'] ) ) {
-			$response_request['_fields'] = $request['_fields'];
-		}
-
-		return $this->prepare_item_for_response( $post, $response_request );
-	}
 }
diff --git a/src/wp-includes/script-modules.php b/src/wp-includes/script-modules.php
index c9afb2614b232..3e5c39bff18d5 100644
--- a/src/wp-includes/script-modules.php
+++ b/src/wp-includes/script-modules.php
@@ -190,11 +190,7 @@ function wp_default_script_modules() {
 			wp_interactivity()->add_client_navigation_support_to_script_module( $script_module_id );
 		}
 
-		// VIPS files are always minified — the non-minified versions are not
-		// shipped because they are ~10MB of inlined WASM with no debugging value.
-		if ( str_starts_with( $file_name, 'vips/' ) ) {
-			$file_name = str_replace( '.js', '.min.js', $file_name );
-		} elseif ( '' !== $suffix ) {
+		if ( '' !== $suffix ) {
 			$file_name = str_replace( '.js', $suffix . '.js', $file_name );
 		}
 
diff --git a/tests/phpunit/tests/media/wpCrossOriginIsolation.php b/tests/phpunit/tests/media/wpCrossOriginIsolation.php
deleted file mode 100644
index 3ec4231d5bede..0000000000000
--- a/tests/phpunit/tests/media/wpCrossOriginIsolation.php
+++ /dev/null
@@ -1,365 +0,0 @@
-<?php
-
-/**
- * Tests for cross-origin isolation functions.
- *
- * @group media
- * @covers ::wp_set_up_cross_origin_isolation
- * @covers ::wp_start_cross_origin_isolation_output_buffer
- * @covers ::wp_is_client_side_media_processing_enabled
- */
-class Tests_Media_wpCrossOriginIsolation extends WP_UnitTestCase {
-
-	/**
-	 * Original HTTP_USER_AGENT value.
-	 */
-	private ?string $original_user_agent;
-
-	/**
-	 * Original HTTP_HOST value.
-	 */
-	private ?string $original_http_host;
-
-	/**
-	 * Original HTTPS value.
-	 */
-	private ?string $original_https;
-
-	/**
-	 * Original $_GET['action'] value.
-	 */
-	private ?string $original_get_action;
-
-	public function set_up() {
-		parent::set_up();
-		$this->original_user_agent = $_SERVER['HTTP_USER_AGENT'] ?? null;
-		$this->original_http_host  = $_SERVER['HTTP_HOST'] ?? null;
-		$this->original_https      = $_SERVER['HTTPS'] ?? null;
-		$this->original_get_action = $_GET['action'] ?? null;
-	}
-
-	public function tear_down() {
-		if ( null === $this->original_user_agent ) {
-			unset( $_SERVER['HTTP_USER_AGENT'] );
-		} else {
-			$_SERVER['HTTP_USER_AGENT'] = $this->original_user_agent;
-		}
-
-		if ( null === $this->original_http_host ) {
-			unset( $_SERVER['HTTP_HOST'] );
-		} else {
-			$_SERVER['HTTP_HOST'] = $this->original_http_host;
-		}
-
-		if ( null === $this->original_https ) {
-			unset( $_SERVER['HTTPS'] );
-		} else {
-			$_SERVER['HTTPS'] = $this->original_https;
-		}
-
-		if ( null === $this->original_get_action ) {
-			unset( $_GET['action'] );
-		} else {
-			$_GET['action'] = $this->original_get_action;
-		}
-
-		// Clean up any output buffers started during tests.
-		while ( ob_get_level() > 1 ) {
-			ob_end_clean();
-		}
-
-		remove_all_filters( 'wp_client_side_media_processing_enabled' );
-		parent::tear_down();
-	}
-
-	/**
-	 * @ticket 64766
-	 */
-	public function test_returns_early_when_client_side_processing_disabled() {
-		add_filter( 'wp_client_side_media_processing_enabled', '__return_false' );
-
-		// Should not error or start an output buffer.
-		$level_before = ob_get_level();
-		wp_set_up_cross_origin_isolation();
-		$level_after = ob_get_level();
-
-		$this->assertSame( $level_before, $level_after );
-	}
-
-	/**
-	 * @ticket 64766
-	 */
-	public function test_returns_early_when_no_screen() {
-		// No screen is set, so it should return early.
-		$level_before = ob_get_level();
-		wp_set_up_cross_origin_isolation();
-		$level_after = ob_get_level();
-
-		$this->assertSame( $level_before, $level_after );
-	}
-
-	/**
-	 * This test must run in a separate process because the output buffer
-	 * callback sends HTTP headers via header(), which would fail in the
-	 * main PHPUnit process where output has already started.
-	 *
-	 * @ticket 64766
-	 *
-	 * @runInSeparateProcess
-	 * @preserveGlobalState disabled
-	 */
-	public function test_starts_output_buffer_for_chrome_137() {
-		$_SERVER['HTTP_USER_AGENT'] = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36';
-
-		$level_before = ob_get_level();
-		wp_start_cross_origin_isolation_output_buffer();
-		$level_after = ob_get_level();
-
-		$this->assertSame( $level_before + 1, $level_after, 'Output buffer should be started for Chrome 137.' );
-
-		ob_end_clean();
-	}
-
-	/**
-	 * @ticket 64766
-	 */
-	public function test_does_not_start_output_buffer_for_chrome_136() {
-		$_SERVER['HTTP_USER_AGENT'] = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36';
-
-		$level_before = ob_get_level();
-		wp_start_cross_origin_isolation_output_buffer();
-		$level_after = ob_get_level();
-
-		$this->assertSame( $level_before, $level_after, 'Output buffer should not be started for Chrome < 137.' );
-	}
-
-	/**
-	 * @ticket 64766
-	 */
-	public function test_does_not_start_output_buffer_for_firefox() {
-		$_SERVER['HTTP_USER_AGENT'] = 'Mozilla/5.0 (Windows NT 10.0; rv:128.0) Gecko/20100101 Firefox/128.0';
-
-		$level_before = ob_get_level();
-		wp_start_cross_origin_isolation_output_buffer();
-		$level_after = ob_get_level();
-
-		$this->assertSame( $level_before, $level_after, 'Output buffer should not be started for Firefox.' );
-	}
-
-	/**
-	 * @ticket 64766
-	 */
-	public function test_does_not_start_output_buffer_for_safari() {
-		$_SERVER['HTTP_USER_AGENT'] = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 14_5) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Safari/605.1.15';
-
-		$level_before = ob_get_level();
-		wp_start_cross_origin_isolation_output_buffer();
-		$level_after = ob_get_level();
-
-		$this->assertSame( $level_before, $level_after, 'Output buffer should not be started for Safari.' );
-	}
-
-	/**
-	 * @ticket 64803
-	 */
-	public function test_client_side_processing_disabled_on_non_secure_origin() {
-		$_SERVER['HTTP_HOST'] = 'example.com';
-		$_SERVER['HTTPS']     = '';
-
-		$this->assertFalse(
-			wp_is_client_side_media_processing_enabled(),
-			'Client-side media processing should be disabled on non-secure, non-localhost origins.'
-		);
-	}
-
-	/**
-	 * @ticket 64803
-	 */
-	public function test_client_side_processing_enabled_on_localhost() {
-		$_SERVER['HTTP_HOST'] = 'localhost';
-		$_SERVER['HTTPS']     = '';
-
-		$this->assertTrue(
-			wp_is_client_side_media_processing_enabled(),
-			'Client-side media processing should be enabled on localhost.'
-		);
-	}
-
-	/**
-	 * Verifies that cross-origin elements get crossorigin="anonymous" added.
-	 *
-	 * @ticket 64766
-	 *
-	 * @runInSeparateProcess
-	 * @preserveGlobalState disabled
-	 *
-	 * @dataProvider data_elements_that_should_get_crossorigin
-	 *
-	 * @param string $html HTML input to process.
-	 */
-	public function test_output_buffer_adds_crossorigin( $html ) {
-		$_SERVER['HTTP_USER_AGENT'] = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36';
-
-		ob_start();
-
-		wp_start_cross_origin_isolation_output_buffer();
-		echo $html;
-
-		ob_end_flush();
-		$output = ob_get_clean();
-
-		$this->assertStringContainsString( 'crossorigin="anonymous"', $output );
-	}
-
-	/**
-	 * Data provider for elements that should receive crossorigin="anonymous".
-	 *
-	 * @return array[]
-	 */
-	public function data_elements_that_should_get_crossorigin() {
-		return array(
-			'cross-origin script'              => array(
-				'<script src="https://external.example.com/script.js"></script>',
-			),
-			'cross-origin audio'               => array(
-				'<audio src="https://external.example.com/audio.mp3"></audio>',
-			),
-			'cross-origin video'               => array(
-				'<video src="https://external.example.com/video.mp4"></video>',
-			),
-			'cross-origin link stylesheet'     => array(
-				'<link rel="stylesheet" href="https://external.example.com/style.css" />',
-			),
-			'cross-origin source inside video' => array(
-				'<video><source src="https://external.example.com/video.mp4" type="video/mp4" /></video>',
-			),
-		);
-	}
-
-	/**
-	 * Verifies that certain elements do not get crossorigin="anonymous" added.
-	 *
-	 * Images are excluded because under Document-Isolation-Policy:
-	 * isolate-and-credentialless, the browser handles cross-origin images
-	 * in credentialless mode without needing explicit CORS headers.
-	 *
-	 * @ticket 64766
-	 *
-	 * @runInSeparateProcess
-	 * @preserveGlobalState disabled
-	 *
-	 * @dataProvider data_elements_that_should_not_get_crossorigin
-	 *
-	 * @param string $html HTML input to process.
-	 */
-	public function test_output_buffer_does_not_add_crossorigin( $html ) {
-		$_SERVER['HTTP_USER_AGENT'] = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36';
-
-		ob_start();
-
-		wp_start_cross_origin_isolation_output_buffer();
-		echo $html;
-
-		ob_end_flush();
-		$output = ob_get_clean();
-
-		$this->assertStringNotContainsString( 'crossorigin="anonymous"', $output );
-	}
-
-	/**
-	 * Data provider for elements that should not receive crossorigin="anonymous".
-	 *
-	 * @return array[]
-	 */
-	public function data_elements_that_should_not_get_crossorigin() {
-		return array(
-			'cross-origin img'                        => array(
-				'<img src="https://external.example.com/image.jpg" />',
-			),
-			'cross-origin img with srcset'            => array(
-				'<img src="https://external.example.com/image.jpg" srcset="https://external.example.com/image-2x.jpg 2x" />',
-			),
-			'link with cross-origin imagesrcset only' => array(
-				'<link rel="preload" as="image" imagesrcset="https://external.example.com/image.jpg 1x" href="/local-fallback.jpg" />',
-			),
-			'relative URL script'                     => array(
-				'<script src="/wp-includes/js/wp-embed.min.js"></script>',
-			),
-		);
-	}
-
-	/**
-	 * Same-origin URLs should not get crossorigin="anonymous".
-	 *
-	 * Uses site_url() at runtime since the test domain varies by CI config.
-	 *
-	 * @ticket 64766
-	 *
-	 * @runInSeparateProcess
-	 * @preserveGlobalState disabled
-	 */
-	public function test_output_buffer_does_not_add_crossorigin_to_same_origin() {
-		$_SERVER['HTTP_USER_AGENT'] = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36';
-
-		ob_start();
-
-		wp_start_cross_origin_isolation_output_buffer();
-		echo '<script src="' . site_url( '/wp-includes/js/wp-embed.min.js' ) . '"></script>';
-
-		ob_end_flush();
-		$output = ob_get_clean();
-
-		$this->assertStringNotContainsString( 'crossorigin="anonymous"', $output );
-	}
-
-	/**
-	 * Elements that already have a crossorigin attribute should not be modified.
-	 *
-	 * @ticket 64766
-	 *
-	 * @runInSeparateProcess
-	 * @preserveGlobalState disabled
-	 */
-	public function test_output_buffer_does_not_override_existing_crossorigin() {
-		$_SERVER['HTTP_USER_AGENT'] = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36';
-
-		ob_start();
-
-		wp_start_cross_origin_isolation_output_buffer();
-		echo '<script src="https://external.example.com/script.js" crossorigin="use-credentials"></script>';
-
-		ob_end_flush();
-		$output = ob_get_clean();
-
-		$this->assertStringContainsString( 'crossorigin="use-credentials"', $output, 'Existing crossorigin attribute should not be overridden.' );
-		$this->assertStringNotContainsString( 'crossorigin="anonymous"', $output );
-	}
-
-	/**
-	 * Multiple tags in the same output should each be handled correctly.
-	 *
-	 * @ticket 64766
-	 *
-	 * @runInSeparateProcess
-	 * @preserveGlobalState disabled
-	 */
-	public function test_output_buffer_handles_mixed_tags() {
-		$_SERVER['HTTP_USER_AGENT'] = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36';
-
-		ob_start();
-
-		wp_start_cross_origin_isolation_output_buffer();
-		echo '<img src="https://external.example.com/image.jpg" />';
-		echo '<script src="https://external.example.com/script.js"></script>';
-		echo '<audio src="https://external.example.com/audio.mp3"></audio>';
-
-		ob_end_flush();
-		$output = ob_get_clean();
-
-		// IMG should NOT have crossorigin.
-		$this->assertStringContainsString( '<img src="https://external.example.com/image.jpg" />', $output, 'IMG should not be modified.' );
-
-		// Script and audio should have crossorigin.
-		$this->assertSame( 2, substr_count( $output, 'crossorigin="anonymous"' ), 'Script and audio should both get crossorigin, but not img.' );
-	}
-}
diff --git a/tests/phpunit/tests/media/wpGetChromiumMajorVersion.php b/tests/phpunit/tests/media/wpGetChromiumMajorVersion.php
deleted file mode 100644
index 7249d9b91b665..0000000000000
--- a/tests/phpunit/tests/media/wpGetChromiumMajorVersion.php
+++ /dev/null
@@ -1,69 +0,0 @@
-<?php
-
-/**
- * Tests for the `wp_get_chromium_major_version()` function.
- *
- * @group media
- * @covers ::wp_get_chromium_major_version
- */
-class Tests_Media_wpGetChromiumMajorVersion extends WP_UnitTestCase {
-
-	/**
-	 * Original HTTP_USER_AGENT value.
-	 *
-	 * @var string|null
-	 */
-	private $original_user_agent;
-
-	public function set_up() {
-		parent::set_up();
-		$this->original_user_agent = isset( $_SERVER['HTTP_USER_AGENT'] ) ? $_SERVER['HTTP_USER_AGENT'] : null;
-	}
-
-	public function tear_down() {
-		if ( null === $this->original_user_agent ) {
-			unset( $_SERVER['HTTP_USER_AGENT'] );
-		} else {
-			$_SERVER['HTTP_USER_AGENT'] = $this->original_user_agent;
-		}
-		parent::tear_down();
-	}
-
-	/**
-	 * @ticket 64766
-	 */
-	public function test_returns_null_when_no_user_agent() {
-		unset( $_SERVER['HTTP_USER_AGENT'] );
-		$this->assertNull( wp_get_chromium_major_version() );
-	}
-
-	/**
-	 * @ticket 64766
-	 *
-	 * @dataProvider data_user_agents
-	 *
-	 * @param string   $user_agent The user agent string.
-	 * @param int|null $expected   The expected Chromium major version, or null.
-	 */
-	public function test_returns_expected_version( $user_agent, $expected ) {
-		$_SERVER['HTTP_USER_AGENT'] = $user_agent;
-		$this->assertSame( $expected, wp_get_chromium_major_version() );
-	}
-
-	/**
-	 * Data provider for test_returns_expected_version.
-	 *
-	 * @return array[]
-	 */
-	public function data_user_agents() {
-		return array(
-			'empty user agent'   => array( '', null ),
-			'Firefox'            => array( 'Mozilla/5.0 (Windows NT 10.0; rv:128.0) Gecko/20100101 Firefox/128.0', null ),
-			'Safari'             => array( 'Mozilla/5.0 (Macintosh; Intel Mac OS X 14_5) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Safari/605.1.15', null ),
-			'Chrome 137'         => array( 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36', 137 ),
-			'Edge 137'           => array( 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36 Edg/137.0.0.0', 137 ),
-			'Opera (Chrome 136)' => array( 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36 OPR/122.0.0.0', 136 ),
-			'Chrome 100'         => array( 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.75 Safari/537.36', 100 ),
-		);
-	}
-}
diff --git a/tests/phpunit/tests/rest-api/rest-attachments-controller.php b/tests/phpunit/tests/rest-api/rest-attachments-controller.php
index 79e9d23cf9dd3..c8746931ed30a 100644
--- a/tests/phpunit/tests/rest-api/rest-attachments-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-attachments-controller.php
@@ -194,18 +194,6 @@ public function tear_down() {
 		parent::tear_down();
 	}
 
-	/**
-	 * Enables client-side media processing and reinitializes the REST server
-	 * so that the sideload and finalize routes are registered.
-	 */
-	private function enable_client_side_media_processing(): void {
-		add_filter( 'wp_client_side_media_processing_enabled', '__return_true' );
-
-		global $wp_rest_server;
-		$wp_rest_server = new Spy_REST_Server();
-		do_action( 'rest_api_init', $wp_rest_server );
-	}
-
 	public function test_register_routes() {
 		$routes = rest_get_server()->get_routes();
 		$this->assertArrayHasKey( '/wp/v2/media', $routes );
@@ -2941,43 +2929,6 @@ public function test_upload_unsupported_image_type_with_filter() {
 		$this->assertSame( 201, $response->get_status() );
 	}
 
-	/**
-	 * Test that unsupported image type check is skipped when not generating sub-sizes.
-	 *
-	 * When the client handles image processing (generate_sub_sizes is false),
-	 * the server should not check image editor support.
-	 *
-	 * Tests the permissions check directly with file params set, since the core
-	 * check uses get_file_params() which is only populated for multipart uploads.
-	 *
-	 * @ticket 64836
-	 */
-	public function test_upload_unsupported_image_type_skipped_when_not_generating_sub_sizes() {
-		wp_set_current_user( self::$author_id );
-
-		add_filter( 'wp_image_editors', '__return_empty_array' );
-
-		$request = new WP_REST_Request( 'POST', '/wp/v2/media' );
-		$request->set_file_params(
-			array(
-				'file' => array(
-					'name'     => 'avif-lossy.avif',
-					'type'     => 'image/avif',
-					'tmp_name' => self::$test_avif_file,
-					'error'    => 0,
-					'size'     => filesize( self::$test_avif_file ),
-				),
-			)
-		);
-		$request->set_param( 'generate_sub_sizes', false );
-
-		$controller = new WP_REST_Attachments_Controller( 'attachment' );
-		$result     = $controller->create_item_permissions_check( $request );
-
-		// Should pass because generate_sub_sizes is false (client handles processing).
-		$this->assertTrue( $result );
-	}
-
 	/**
 	 * Test that unsupported image type check is enforced when generating sub-sizes.
 	 *
@@ -3240,305 +3191,4 @@ static function ( $data ) use ( &$captured_data ) {
 		// Verify that the data is an array (not an object).
 		$this->assertIsArray( $captured_data, 'Data passed to wp_insert_attachment should be an array' );
 	}
-
-	/**
-	 * Tests sideloading a scaled image for an existing attachment.
-	 *
-	 * @ticket 64737
-	 * @requires function imagejpeg
-	 */
-	public function test_sideload_scaled_image() {
-		$this->enable_client_side_media_processing();
-
-		wp_set_current_user( self::$author_id );
-
-		// First, create an attachment.
-		$request = new WP_REST_Request( 'POST', '/wp/v2/media' );
-		$request->set_header( 'Content-Type', 'image/jpeg' );
-		$request->set_header( 'Content-Disposition', 'attachment; filename=canola.jpg' );
-		$request->set_body( file_get_contents( self::$test_file ) );
-		$response      = rest_get_server()->dispatch( $request );
-		$data          = $response->get_data();
-		$attachment_id = $data['id'];
-
-		$this->assertSame( 201, $response->get_status() );
-
-		$original_file = get_attached_file( $attachment_id, true );
-
-		// Sideload a "scaled" version of the image.
-		$request = new WP_REST_Request( 'POST', "/wp/v2/media/{$attachment_id}/sideload" );
-		$request->set_header( 'Content-Type', 'image/jpeg' );
-		$request->set_header( 'Content-Disposition', 'attachment; filename=canola-scaled.jpg' );
-		$request->set_param( 'image_size', 'scaled' );
-		$request->set_body( file_get_contents( self::$test_file ) );
-		$response = rest_get_server()->dispatch( $request );
-
-		$this->assertSame( 200, $response->get_status(), 'Sideloading scaled image should succeed.' );
-
-		$metadata = wp_get_attachment_metadata( $attachment_id );
-
-		// The original file should now be recorded as original_image.
-		$this->assertArrayHasKey( 'original_image', $metadata, 'Metadata should contain original_image.' );
-		$this->assertSame( wp_basename( $original_file ), $metadata['original_image'], 'original_image should be the basename of the original attached file.' );
-
-		// The attached file should now point to the scaled version.
-		$new_file = get_attached_file( $attachment_id, true );
-		$this->assertStringContainsString( 'scaled', wp_basename( $new_file ), 'Attached file should now be the scaled version.' );
-
-		// Metadata should have width, height, filesize, and file updated.
-		$this->assertArrayHasKey( 'width', $metadata, 'Metadata should contain width.' );
-		$this->assertArrayHasKey( 'height', $metadata, 'Metadata should contain height.' );
-		$this->assertArrayHasKey( 'filesize', $metadata, 'Metadata should contain filesize.' );
-		$this->assertArrayHasKey( 'file', $metadata, 'Metadata should contain file.' );
-		$this->assertStringContainsString( 'scaled', $metadata['file'], 'Metadata file should reference the scaled version.' );
-		$this->assertGreaterThan( 0, $metadata['width'], 'Width should be positive.' );
-		$this->assertGreaterThan( 0, $metadata['height'], 'Height should be positive.' );
-		$this->assertGreaterThan( 0, $metadata['filesize'], 'Filesize should be positive.' );
-	}
-
-	/**
-	 * Tests that sideloading scaled image requires authentication.
-	 *
-	 * @ticket 64737
-	 * @requires function imagejpeg
-	 */
-	public function test_sideload_scaled_image_requires_auth() {
-		$this->enable_client_side_media_processing();
-
-		wp_set_current_user( self::$author_id );
-
-		// Create an attachment.
-		$request = new WP_REST_Request( 'POST', '/wp/v2/media' );
-		$request->set_header( 'Content-Type', 'image/jpeg' );
-		$request->set_header( 'Content-Disposition', 'attachment; filename=canola.jpg' );
-		$request->set_body( file_get_contents( self::$test_file ) );
-		$response      = rest_get_server()->dispatch( $request );
-		$attachment_id = $response->get_data()['id'];
-
-		// Try sideloading without authentication.
-		wp_set_current_user( 0 );
-
-		$request = new WP_REST_Request( 'POST', "/wp/v2/media/{$attachment_id}/sideload" );
-		$request->set_header( 'Content-Type', 'image/jpeg' );
-		$request->set_header( 'Content-Disposition', 'attachment; filename=canola-scaled.jpg' );
-		$request->set_param( 'image_size', 'scaled' );
-		$request->set_body( file_get_contents( self::$test_file ) );
-		$response = rest_get_server()->dispatch( $request );
-
-		$this->assertErrorResponse( 'rest_cannot_edit_image', $response, 401 );
-	}
-
-	/**
-	 * Tests that the sideload endpoint includes 'scaled' in the image_size enum.
-	 *
-	 * @ticket 64737
-	 */
-	public function test_sideload_route_includes_scaled_enum() {
-		$this->enable_client_side_media_processing();
-
-		$server = rest_get_server();
-		$routes = $server->get_routes();
-
-		$endpoint = '/wp/v2/media/(?P<id>[\d]+)/sideload';
-		$this->assertArrayHasKey( $endpoint, $routes, 'Sideload route should exist.' );
-
-		$route    = $routes[ $endpoint ];
-		$endpoint = $route[0];
-		$args     = $endpoint['args'];
-
-		$param_name = 'image_size';
-		$this->assertArrayHasKey( $param_name, $args, 'Route should have image_size arg.' );
-		$this->assertContains( 'scaled', $args[ $param_name ]['enum'], 'image_size enum should include scaled.' );
-	}
-
-	/**
-	 * Tests the filter_wp_unique_filename method handles the -scaled suffix.
-	 *
-	 * @ticket 64737
-	 * @requires function imagejpeg
-	 */
-	public function test_sideload_scaled_unique_filename() {
-		$this->enable_client_side_media_processing();
-
-		wp_set_current_user( self::$author_id );
-
-		// Create an attachment.
-		$request = new WP_REST_Request( 'POST', '/wp/v2/media' );
-		$request->set_header( 'Content-Type', 'image/jpeg' );
-		$request->set_header( 'Content-Disposition', 'attachment; filename=canola.jpg' );
-		$request->set_body( file_get_contents( self::$test_file ) );
-		$response      = rest_get_server()->dispatch( $request );
-		$attachment_id = $response->get_data()['id'];
-
-		// Sideload with the -scaled suffix.
-		$request = new WP_REST_Request( 'POST', "/wp/v2/media/{$attachment_id}/sideload" );
-		$request->set_header( 'Content-Type', 'image/jpeg' );
-		$request->set_header( 'Content-Disposition', 'attachment; filename=canola-scaled.jpg' );
-		$request->set_param( 'image_size', 'scaled' );
-		$request->set_body( file_get_contents( self::$test_file ) );
-		$response = rest_get_server()->dispatch( $request );
-
-		$this->assertSame( 200, $response->get_status(), 'Sideloading scaled image should succeed.' );
-
-		// The filename should retain the -scaled suffix without numeric disambiguation.
-		$new_file = get_attached_file( $attachment_id, true );
-		$basename = wp_basename( $new_file );
-		$this->assertMatchesRegularExpression( '/canola-scaled\.jpg$/', $basename, 'Scaled filename should not have numeric suffix appended.' );
-	}
-
-	/**
-	 * Tests that sideloading a scaled image for a different attachment retains the numeric suffix
-	 * when a file with the same name already exists on disk.
-	 *
-	 * @ticket 64737
-	 * @requires function imagejpeg
-	 */
-	public function test_sideload_scaled_unique_filename_conflict() {
-		$this->enable_client_side_media_processing();
-
-		wp_set_current_user( self::$author_id );
-
-		// Create the first attachment.
-		$request = new WP_REST_Request( 'POST', '/wp/v2/media' );
-		$request->set_header( 'Content-Type', 'image/jpeg' );
-		$request->set_header( 'Content-Disposition', 'attachment; filename=canola.jpg' );
-		$request->set_body( file_get_contents( self::$test_file ) );
-		$response        = rest_get_server()->dispatch( $request );
-		$attachment_id_a = $response->get_data()['id'];
-
-		// Sideload a scaled image for attachment A, creating canola-scaled.jpg on disk.
-		$request = new WP_REST_Request( 'POST', "/wp/v2/media/{$attachment_id_a}/sideload" );
-		$request->set_header( 'Content-Type', 'image/jpeg' );
-		$request->set_header( 'Content-Disposition', 'attachment; filename=canola-scaled.jpg' );
-		$request->set_param( 'image_size', 'scaled' );
-		$request->set_body( file_get_contents( self::$test_file ) );
-		$response = rest_get_server()->dispatch( $request );
-
-		$this->assertSame( 200, $response->get_status(), 'First sideload should succeed.' );
-
-		// Create a second, different attachment.
-		$request = new WP_REST_Request( 'POST', '/wp/v2/media' );
-		$request->set_header( 'Content-Type', 'image/jpeg' );
-		$request->set_header( 'Content-Disposition', 'attachment; filename=other.jpg' );
-		$request->set_body( file_get_contents( self::$test_file ) );
-		$response        = rest_get_server()->dispatch( $request );
-		$attachment_id_b = $response->get_data()['id'];
-
-		// Sideload scaled for attachment B using the same filename that already exists on disk.
-		$request = new WP_REST_Request( 'POST', "/wp/v2/media/{$attachment_id_b}/sideload" );
-		$request->set_header( 'Content-Type', 'image/jpeg' );
-		$request->set_header( 'Content-Disposition', 'attachment; filename=canola-scaled.jpg' );
-		$request->set_param( 'image_size', 'scaled' );
-		$request->set_body( file_get_contents( self::$test_file ) );
-		$response = rest_get_server()->dispatch( $request );
-
-		$this->assertSame( 200, $response->get_status(), 'Second sideload should succeed.' );
-
-		// The filename should have a numeric suffix since the base name does not match this attachment.
-		$new_file = get_attached_file( $attachment_id_b, true );
-		$basename = wp_basename( $new_file );
-		$this->assertMatchesRegularExpression( '/canola-scaled-\d+\.jpg$/', $basename, 'Scaled filename should have numeric suffix when file conflicts with a different attachment.' );
-	}
-
-	/**
-	 * Tests that the finalize endpoint triggers wp_generate_attachment_metadata.
-	 *
-	 * @ticket 62243
-	 * @covers WP_REST_Attachments_Controller::finalize_item
-	 * @requires function imagejpeg
-	 */
-	public function test_finalize_item(): void {
-		$this->enable_client_side_media_processing();
-
-		wp_set_current_user( self::$author_id );
-
-		// Create an attachment.
-		$request = new WP_REST_Request( 'POST', '/wp/v2/media' );
-		$request->set_header( 'Content-Type', 'image/jpeg' );
-		$request->set_header( 'Content-Disposition', 'attachment; filename=canola.jpg' );
-		$request->set_body( (string) file_get_contents( self::$test_file ) );
-		$response      = rest_get_server()->dispatch( $request );
-		$attachment_id = $response->get_data()['id'];
-
-		$this->assertSame( 201, $response->get_status() );
-
-		// Track whether wp_generate_attachment_metadata filter fires.
-		$filter_metadata = null;
-		$filter_id       = null;
-		$filter_context  = null;
-		add_filter(
-			'wp_generate_attachment_metadata',
-			function ( array $metadata, int $id, string $context ) use ( &$filter_metadata, &$filter_id, &$filter_context ) {
-				$filter_metadata = $metadata;
-				$filter_id       = $id;
-				$filter_context  = $context;
-				$metadata['foo'] = 'bar';
-				return $metadata;
-			},
-			10,
-			3
-		);
-
-		// Call the finalize endpoint.
-		$request  = new WP_REST_Request( 'POST', "/wp/v2/media/{$attachment_id}/finalize" );
-		$response = rest_get_server()->dispatch( $request );
-
-		$this->assertSame( 200, $response->get_status(), 'Finalize endpoint should return 200.' );
-		$this->assertIsArray( $filter_metadata );
-		$this->assertStringContainsString( 'canola', $filter_metadata['file'], 'Expected the canola image to have been had its metadata updated.' );
-		$this->assertSame( $attachment_id, $filter_id, 'Expected the post ID to be passed to the filter.' );
-		$this->assertSame( 'update', $filter_context, 'Filter context should be "update".' );
-		$resulting_metadata = wp_get_attachment_metadata( $attachment_id );
-		$this->assertIsArray( $resulting_metadata );
-		$this->assertArrayHasKey( 'foo', $resulting_metadata, 'Expected new metadata key to have been added.' );
-		$this->assertSame( 'bar', $resulting_metadata['foo'], 'Expected filtered metadata to be updated.' );
-	}
-
-	/**
-	 * Tests that the finalize endpoint requires authentication.
-	 *
-	 * @ticket 62243
-	 * @covers WP_REST_Attachments_Controller::finalize_item
-	 * @requires function imagejpeg
-	 */
-	public function test_finalize_item_requires_auth(): void {
-		$this->enable_client_side_media_processing();
-
-		wp_set_current_user( self::$author_id );
-
-		// Create an attachment.
-		$request = new WP_REST_Request( 'POST', '/wp/v2/media' );
-		$request->set_header( 'Content-Type', 'image/jpeg' );
-		$request->set_header( 'Content-Disposition', 'attachment; filename=canola.jpg' );
-		$request->set_body( (string) file_get_contents( self::$test_file ) );
-		$response      = rest_get_server()->dispatch( $request );
-		$attachment_id = $response->get_data()['id'];
-
-		// Try finalizing without authentication.
-		wp_set_current_user( 0 );
-
-		$request  = new WP_REST_Request( 'POST', "/wp/v2/media/{$attachment_id}/finalize" );
-		$response = rest_get_server()->dispatch( $request );
-
-		$this->assertErrorResponse( 'rest_cannot_edit_image', $response, 401 );
-	}
-
-	/**
-	 * Tests that the finalize endpoint returns error for invalid attachment ID.
-	 *
-	 * @ticket 62243
-	 * @covers WP_REST_Attachments_Controller::finalize_item
-	 */
-	public function test_finalize_item_invalid_id(): void {
-		$this->enable_client_side_media_processing();
-
-		wp_set_current_user( self::$author_id );
-
-		$invalid_id = PHP_INT_MAX;
-		$this->assertNull( get_post( $invalid_id ), 'Expected invalid ID to not exist for an existing post.' );
-		$request  = new WP_REST_Request( 'POST', "/wp/v2/media/$invalid_id/finalize" );
-		$response = rest_get_server()->dispatch( $request );
-
-		$this->assertErrorResponse( 'rest_post_invalid_id', $response, 404 );
-	}
 }
diff --git a/tests/phpunit/tests/rest-api/rest-schema-setup.php b/tests/phpunit/tests/rest-api/rest-schema-setup.php
index 89bf2c481c567..9c6c431e5ef35 100644
--- a/tests/phpunit/tests/rest-api/rest-schema-setup.php
+++ b/tests/phpunit/tests/rest-api/rest-schema-setup.php
@@ -16,9 +16,6 @@ class WP_Test_REST_Schema_Initialization extends WP_Test_REST_TestCase {
 	public function set_up() {
 		parent::set_up();
 
-		// Ensure client-side media processing is enabled so the sideload route is registered.
-		add_filter( 'wp_client_side_media_processing_enabled', '__return_true' );
-
 		/** @var WP_REST_Server $wp_rest_server */
 		global $wp_rest_server;
 		$wp_rest_server = new Spy_REST_Server();
@@ -112,8 +109,6 @@ public function test_expected_routes_in_schema() {
 			'/wp/v2/media/(?P<id>[\\d]+)',
 			'/wp/v2/media/(?P<id>[\\d]+)/post-process',
 			'/wp/v2/media/(?P<id>[\\d]+)/edit',
-			'/wp/v2/media/(?P<id>[\\d]+)/sideload',
-			'/wp/v2/media/(?P<id>[\\d]+)/finalize',
 			'/wp/v2/blocks',
 			'/wp/v2/blocks/(?P<id>[\d]+)',
 			'/wp/v2/blocks/(?P<id>[\d]+)/autosaves',
diff --git a/tests/phpunit/tests/script-modules/wpScriptModules.php b/tests/phpunit/tests/script-modules/wpScriptModules.php
index 140531101a1cd..4f647c6a3d2e0 100644
--- a/tests/phpunit/tests/script-modules/wpScriptModules.php
+++ b/tests/phpunit/tests/script-modules/wpScriptModules.php
@@ -1904,24 +1904,22 @@ public function test_dependent_of_default_script_modules() {
 	}
 
 	/**
-	 * Tests that VIPS script modules always use minified file paths.
+	 * Tests that VIPS script modules are not registered in Core.
 	 *
-	 * Non-minified VIPS files are not shipped because they are ~10MB of
-	 * inlined WASM with no debugging value, so the registration should
-	 * always point to the .min.js variants.
+	 * The wasm-vips library is plugin-only and should not be included
+	 * in WordPress Core builds due to its large size (~16MB per file).
 	 *
-	 * @ticket 64734
+	 * @ticket 64906
 	 *
 	 * @covers ::wp_default_script_modules
 	 */
-	public function test_vips_script_modules_always_use_minified_paths() {
+	public function test_vips_script_modules_not_registered_in_core() {
 		wp_default_script_modules();
 		wp_enqueue_script_module( '@wordpress/vips/loader' );
 
 		$actual = get_echo( array( wp_script_modules(), 'print_enqueued_script_modules' ) );
 
-		$this->assertStringContainsString( 'vips/loader.min.js', $actual );
-		$this->assertStringNotContainsString( 'vips/loader.js"', $actual );
+		$this->assertStringNotContainsString( 'vips', $actual );
 	}
 
 	/**
diff --git a/tests/qunit/fixtures/wp-api-generated.js b/tests/qunit/fixtures/wp-api-generated.js
index b953a0303537c..003dc397ae305 100644
--- a/tests/qunit/fixtures/wp-api-generated.js
+++ b/tests/qunit/fixtures/wp-api-generated.js
@@ -3148,18 +3148,6 @@ mockedApiResponse.Schema = {
                             "description": "The ID for the associated post of the attachment.",
                             "type": "integer",
                             "required": false
-                        },
-                        "generate_sub_sizes": {
-                            "type": "boolean",
-                            "default": true,
-                            "description": "Whether to generate image sub sizes.",
-                            "required": false
-                        },
-                        "convert_format": {
-                            "type": "boolean",
-                            "default": true,
-                            "description": "Whether to convert image formats.",
-                            "required": false
                         }
                     }
                 }
@@ -3676,68 +3664,6 @@ mockedApiResponse.Schema = {
                 }
             ]
         },
-        "/wp/v2/media/(?P<id>[\\d]+)/sideload": {
-            "namespace": "wp/v2",
-            "methods": [
-                "POST"
-            ],
-            "endpoints": [
-                {
-                    "methods": [
-                        "POST"
-                    ],
-                    "args": {
-                        "id": {
-                            "description": "Unique identifier for the attachment.",
-                            "type": "integer",
-                            "required": false
-                        },
-                        "image_size": {
-                            "description": "Image size.",
-                            "type": "string",
-                            "enum": [
-                                "thumbnail",
-                                "medium",
-                                "medium_large",
-                                "large",
-                                "1536x1536",
-                                "2048x2048",
-                                "original",
-                                "full",
-                                "scaled"
-                            ],
-                            "required": true
-                        },
-                        "convert_format": {
-                            "type": "boolean",
-                            "default": true,
-                            "description": "Whether to convert image formats.",
-                            "required": false
-                        }
-                    }
-                }
-            ]
-        },
-        "/wp/v2/media/(?P<id>[\\d]+)/finalize": {
-            "namespace": "wp/v2",
-            "methods": [
-                "POST"
-            ],
-            "endpoints": [
-                {
-                    "methods": [
-                        "POST"
-                    ],
-                    "args": {
-                        "id": {
-                            "description": "Unique identifier for the attachment.",
-                            "type": "integer",
-                            "required": false
-                        }
-                    }
-                }
-            ]
-        },
         "/wp/v2/menu-items": {
             "namespace": "wp/v2",
             "methods": [
@@ -12774,43 +12700,6 @@ mockedApiResponse.Schema = {
             ]
         }
     },
-    "image_sizes": {
-        "thumbnail": {
-            "width": 150,
-            "height": 150,
-            "crop": true
-        },
-        "medium": {
-            "width": 300,
-            "height": 300,
-            "crop": false
-        },
-        "medium_large": {
-            "width": 768,
-            "height": 0,
-            "crop": false
-        },
-        "large": {
-            "width": 1024,
-            "height": 1024,
-            "crop": false
-        },
-        "1536x1536": {
-            "width": 1536,
-            "height": 1536,
-            "crop": false
-        },
-        "2048x2048": {
-            "width": 2048,
-            "height": 2048,
-            "crop": false
-        }
-    },
-    "image_size_threshold": 2560,
-    "image_output_formats": {},
-    "jpeg_interlaced": false,
-    "png_interlaced": false,
-    "gif_interlaced": false,
     "site_logo": 0,
     "site_icon": 0,
     "site_icon_url": ""
diff --git a/tools/gutenberg/copy.js b/tools/gutenberg/copy.js
index 0f197169f7366..e5ca8eb71dce5 100644
--- a/tools/gutenberg/copy.js
+++ b/tools/gutenberg/copy.js
@@ -259,6 +259,10 @@ function generateScriptModulesPackages() {
 			const fullPath = path.join( dir, entry.name );
 
 			if ( entry.isDirectory() ) {
+				// Skip plugin-only packages (e.g., vips/wasm) that should not be in Core.
+				if ( entry.name === 'vips' ) {
+					continue;
+				}
 				processDirectory( fullPath, baseDir );
 			} else if ( entry.name.endsWith( '.min.asset.php' ) ) {
 				const relativePath = path.relative( baseDir, fullPath );
@@ -344,6 +348,17 @@ function generateScriptLoaderPackages() {
 				assetData.dependencies = [];
 			}
 
+			// Strip plugin-only module dependencies (e.g., vips) that are not in Core.
+			if ( Array.isArray( assetData.module_dependencies ) ) {
+				assetData.module_dependencies =
+					assetData.module_dependencies.filter(
+						( dep ) =>
+							! ( dep.id || dep ).startsWith(
+								'@wordpress/vips'
+							)
+					);
+			}
+
 			assets[ `${ entry.name }.js` ] = assetData;
 		} catch ( error ) {
 			console.error(