diff --git a/package.json b/package.json
index 15cdc30c..a2cb7836 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@code-dot-org/ml-playground",
-  "version": "0.0.50",
+  "version": "0.0.51",
   "private": false,
   "repository": {
     "type": "git",
@@ -81,7 +81,7 @@
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "react-papaparse": "^3.8.0",
-    "react-redux": "^9.2.0",
+    "react-redux": "^8.1.3",
     "redux": "^4.0.5",
     "style-loader": "^4.0.0",
     "ts-loader": "^9.5.7",
diff --git a/src/redux.ts b/src/redux.ts
index f9790d8f..702d8447 100644
--- a/src/redux.ts
+++ b/src/redux.ts
@@ -416,10 +416,20 @@ export default function rootReducer(
   }
   if (action.type === SET_IMPORTED_DATA) {
     if (state.currentPanel === 'selectDataset') {
-      state.instructionsKeyCallback!(
-        action.userUploadedData ? 'uploadedDataset' : 'selectedDataset',
-        null,
-      );
+      // Reducer must stay pure: the consumer-supplied callback dispatches
+      // into its own redux store, which would interleave React commits
+      // (and a getState cascade) into this dispatch and trip the
+      // "getState() while reducer is executing" guard. Defer to a
+      // microtask so the dispatch fully unwinds before the callback fires.
+      if (state.instructionsKeyCallback) {
+        const callback = state.instructionsKeyCallback;
+        queueMicrotask(() =>
+          callback(
+            action.userUploadedData ? 'uploadedDataset' : 'selectedDataset',
+            null,
+          ),
+        );
+      }
     }
 
     return {
@@ -601,7 +611,13 @@ export default function rootReducer(
         state.viewedPanels.push(action.currentPanel);
         showedOverlay = true;
       }
-      state.instructionsKeyCallback(action.currentPanel, options);
+      // Deferred to a microtask — see the comment on the SET_IMPORTED_DATA
+      // branch above for why the reducer must not synchronously fire a
+      // consumer callback that dispatches into another store.
+      const callback = state.instructionsKeyCallback;
+      const callbackAction = action.currentPanel;
+      const callbackOptions = options;
+      queueMicrotask(() => callback(callbackAction, callbackOptions));
     }
 
     if (action.currentPanel === 'dataDisplayLabel') {
@@ -670,7 +686,11 @@ export default function rootReducer(
     } else if (state.currentColumn === action.currentColumn) {
       // If column is selected, then deselect.
       if (state.currentPanel === 'dataDisplayFeatures') {
-        state.instructionsKeyCallback!('dataDisplayFeatures', null);
+        // Deferred — see SET_IMPORTED_DATA comment.
+        if (state.instructionsKeyCallback) {
+          const callback = state.instructionsKeyCallback;
+          queueMicrotask(() => callback('dataDisplayFeatures', null));
+        }
       }
       return {
         ...state,
@@ -678,16 +698,20 @@ export default function rootReducer(
       };
     } else {
       if (state.currentPanel === 'dataDisplayFeatures') {
-        if (
-          state.columnsByDataType[action.currentColumn] ===
-          ColumnTypes.NUMERICAL
-        ) {
-          state.instructionsKeyCallback!('selectedFeatureNumerical', null);
-        } else if (
-          state.columnsByDataType[action.currentColumn] ===
-          ColumnTypes.CATEGORICAL
-        ) {
-          state.instructionsKeyCallback!('selectedFeatureCategorical', null);
+        // Deferred — see SET_IMPORTED_DATA comment.
+        if (state.instructionsKeyCallback) {
+          const callback = state.instructionsKeyCallback;
+          if (
+            state.columnsByDataType[action.currentColumn] ===
+            ColumnTypes.NUMERICAL
+          ) {
+            queueMicrotask(() => callback('selectedFeatureNumerical', null));
+          } else if (
+            state.columnsByDataType[action.currentColumn] ===
+            ColumnTypes.CATEGORICAL
+          ) {
+            queueMicrotask(() => callback('selectedFeatureCategorical', null));
+          }
         }
       }
 
@@ -731,10 +755,13 @@ export default function rootReducer(
     };
   }
   if (action.type === SET_SHOW_RESULTS_DETAILS) {
-    state.instructionsKeyCallback!(
-      action.show ? 'resultsDetails' : 'results',
-      null,
-    );
+    // Deferred — see SET_IMPORTED_DATA comment.
+    if (state.instructionsKeyCallback) {
+      const callback = state.instructionsKeyCallback;
+      queueMicrotask(() =>
+        callback(action.show ? 'resultsDetails' : 'results', null),
+      );
+    }
     return {
       ...state,
       showResultsDetails: action.show,
diff --git a/webpack.config.js b/webpack.config.js
index f34f9bb0..22d6fdb0 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -81,6 +81,14 @@ const externalConfig = {
     react: 'react',
     'react-dom': 'react-dom',
     'react/jsx-runtime': 'react/jsx-runtime',
+    // Externalize redux + react-redux so the consumer's instances are
+    // used at runtime. Bundling our own copies creates two react-redux
+    // instances on the page (one ours, one the consumer's) sharing the
+    // same React reconciler — their subscription notification chains
+    // interleave and trip redux's "getState() while reducer is
+    // executing" guard. One instance per page eliminates the race.
+    redux: 'redux',
+    'react-redux': 'react-redux',
   },
 };
 
diff --git a/yarn.lock b/yarn.lock
index ed541d30..26000e94 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -993,6 +993,11 @@
     "@babel/plugin-transform-modules-commonjs" "^7.27.1"
     "@babel/plugin-transform-typescript" "^7.28.5"
 
+"@babel/runtime@^7.12.1":
+  version "7.29.7"
+  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.29.7.tgz#12022450c45a4da6d8d8287b18a4ff2ddb23f768"
+  integrity sha512-Nq8OhGWiZIZGV6hLHoyAKLLcJihP/xFeBMGJoUrxTX2psI8dCifzLhZISFb+VWS3wFMRDmCGw5R+dOySCqPLhw==
+
 "@babel/template@^7.28.6", "@babel/template@^7.3.3":
   version "7.28.6"
   resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.28.6.tgz#0e7e56ecedb78aeef66ce7972b082fce76a23e57"
@@ -1821,6 +1826,13 @@
   dependencies:
     "@types/node" "*"
 
+"@types/hoist-non-react-statics@^3.3.1":
+  version "3.3.7"
+  resolved "https://registry.yarnpkg.com/@types/hoist-non-react-statics/-/hoist-non-react-statics-3.3.7.tgz#306e3a3a73828522efa1341159da4846e7573a6c"
+  integrity sha512-PQTyIulDkIDro8P+IHbKCsw7U2xxBYflVzW/FgWdCAePD9xGSidgA76/GeJ6lBKoblyhf9pBY763gbrN+1dI8g==
+  dependencies:
+    hoist-non-react-statics "^3.3.0"
+
 "@types/http-errors@*":
   version "2.0.5"
   resolved "https://registry.yarnpkg.com/@types/http-errors/-/http-errors-2.0.5.tgz#5b749ab2b16ba113423feb1a64a95dcd30398472"
@@ -1952,10 +1964,10 @@
   resolved "https://registry.yarnpkg.com/@types/stack-utils/-/stack-utils-2.0.3.tgz#6209321eb2c1712a7e7466422b8cb1fc0d9dd5d8"
   integrity sha512-9aEbYZ3TbYMznPdcdr3SmIrLXwC/AKZXQeCf9Pgao5CKb8CyHuEX5jzWPTkvregvhRJHcpRO6BFoGW9ycaOkYw==
 
-"@types/use-sync-external-store@^0.0.6":
-  version "0.0.6"
-  resolved "https://registry.yarnpkg.com/@types/use-sync-external-store/-/use-sync-external-store-0.0.6.tgz#60be8d21baab8c305132eb9cb912ed497852aadc"
-  integrity sha512-zFDAD+tlpf2r4asuHEj0XH6pY6i0g5NeAHPn+15wk3BV6JA69eERFXC1gyGThDkVa1zCyKr5jox1+2LbV/AMLg==
+"@types/use-sync-external-store@^0.0.3":
+  version "0.0.3"
+  resolved "https://registry.yarnpkg.com/@types/use-sync-external-store/-/use-sync-external-store-0.0.3.tgz#b6725d5f4af24ace33b36fafd295136e75509f43"
+  integrity sha512-EwmlvuaxPNej9+T4v5AuBPJa2x2UOJVdjCtDHgcDqitUeOtjnJKJ+apYjVcAoBEMjKW1VVFGZLUb5+qqa09XFA==
 
 "@types/ws@^8.5.10":
   version "8.18.1"
@@ -4241,6 +4253,13 @@ hermes-parser@^0.25.1:
   dependencies:
     hermes-estree "0.25.1"
 
+hoist-non-react-statics@^3.3.0, hoist-non-react-statics@^3.3.2:
+  version "3.3.2"
+  resolved "https://registry.yarnpkg.com/hoist-non-react-statics/-/hoist-non-react-statics-3.3.2.tgz#ece0acaf71d62c2969c2ec59feff42a4b1a85b45"
+  integrity sha512-/gGivxi8JPKWNm/W0jSmzcMPpfpPLc3dY/6GxhX2hQ9iGj3aDfklV4ET7NjKpSinLpJ5vafa9iiGIEZg10SfBw==
+  dependencies:
+    react-is "^16.7.0"
+
 hoopy@^0.1.4:
   version "0.1.4"
   resolved "https://registry.yarnpkg.com/hoopy/-/hoopy-0.1.4.tgz#609207d661100033a9a9402ad3dea677381c1b1d"
@@ -6125,7 +6144,7 @@ react-dom@^18.3.1:
     loose-envify "^1.1.0"
     scheduler "^0.23.2"
 
-react-is@^16.13.1, react-is@^16.8.1:
+react-is@^16.13.1, react-is@^16.7.0, react-is@^16.8.1:
   version "16.13.1"
   resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.13.1.tgz#789729a4dc36de2999dc156dd6c1d9c18cea56a4"
   integrity sha512-24e6ynE2H+OKt4kqsOvNd8kBpV65zoxbA4BVsEOB3ARVWQki/DHzaUoC5KuON/BiccDaCCTZBuOcfZs70kR8bQ==
@@ -6143,13 +6162,17 @@ react-papaparse@^3.8.0:
     "@types/papaparse" "^5.0.4"
     papaparse "^5.2.0"
 
-react-redux@^9.2.0:
-  version "9.3.0"
-  resolved "https://registry.yarnpkg.com/react-redux/-/react-redux-9.3.0.tgz#a30113bb6d95c0a715d54dda4308d450fca6ce09"
-  integrity sha512-KQopgqFo/p/fgmAs5qz6p5RWaNAzq40WAu7fJIXnQpYxFPbJYtsJPWvGeF2rOBaY/kEuV77AVsX8TsQzKm+A/g==
+react-redux@^8.1.3:
+  version "8.1.3"
+  resolved "https://registry.yarnpkg.com/react-redux/-/react-redux-8.1.3.tgz#4fdc0462d0acb59af29a13c27ffef6f49ab4df46"
+  integrity sha512-n0ZrutD7DaX/j9VscF+uTALI3oUPa/pO4Z3soOBIjuRn/FzVu6aehhysxZCLi6y7duMf52WNZGMl7CtuK5EnRw==
   dependencies:
-    "@types/use-sync-external-store" "^0.0.6"
-    use-sync-external-store "^1.4.0"
+    "@babel/runtime" "^7.12.1"
+    "@types/hoist-non-react-statics" "^3.3.1"
+    "@types/use-sync-external-store" "^0.0.3"
+    hoist-non-react-statics "^3.3.2"
+    react-is "^18.0.0"
+    use-sync-external-store "^1.0.0"
 
 react@^18.3.1:
   version "18.3.1"
@@ -7231,7 +7254,7 @@ uri-js@^4.2.2:
   dependencies:
     punycode "^2.1.0"
 
-use-sync-external-store@^1.4.0:
+use-sync-external-store@^1.0.0:
   version "1.6.0"
   resolved "https://registry.yarnpkg.com/use-sync-external-store/-/use-sync-external-store-1.6.0.tgz#b174bfa65cb2b526732d9f2ac0a408027876f32d"
   integrity sha512-Pp6GSwGP/NrPIrxVFAIkOQeyw8lFenOHijQWkUTrDvrF4ALqylP2C/KCkeS9dpUM3KvYRQhna5vt7IL95+ZQ9w==