diff --git a/src/main/java/org/prebid/server/bidder/nexx360/Nexx360Bidder.java b/src/main/java/org/prebid/server/bidder/nexx360/Nexx360Bidder.java
index 180f545bf47..b4b643cc3eb 100644
--- a/src/main/java/org/prebid/server/bidder/nexx360/Nexx360Bidder.java
+++ b/src/main/java/org/prebid/server/bidder/nexx360/Nexx360Bidder.java
@@ -1,6 +1,7 @@
 package org.prebid.server.bidder.nexx360;
 
 import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.iab.openrtb.request.BidRequest;
 import com.iab.openrtb.request.Imp;
 import com.iab.openrtb.response.Bid;
@@ -81,7 +82,9 @@ private ExtImpNexx360 parseImpExt(Imp imp) {
 
     private Imp modifyImp(Imp imp) {
         return imp.toBuilder()
-                .ext(mapper.mapper().createObjectNode().set(BIDDER_NAME, imp.getExt().get("bidder")))
+                .ext(imp.getExt().deepCopy()
+                        .<ObjectNode>without("bidder")
+                        .set(BIDDER_NAME, imp.getExt().get("bidder")))
                 .build();
     }
 
diff --git a/src/main/resources/bidder-config/nexx360.yaml b/src/main/resources/bidder-config/nexx360.yaml
index 443ca7f5ab4..975dcd6a21e 100644
--- a/src/main/resources/bidder-config/nexx360.yaml
+++ b/src/main/resources/bidder-config/nexx360.yaml
@@ -19,4 +19,4 @@ adapters:
         - native
         - audio
       supported-vendors:
-      vendor-id: 0
+      vendor-id: 965
diff --git a/src/test/java/org/prebid/server/bidder/nexx360/Nexx360BidderTest.java b/src/test/java/org/prebid/server/bidder/nexx360/Nexx360BidderTest.java
index 09c50589e19..bb06e21635b 100644
--- a/src/test/java/org/prebid/server/bidder/nexx360/Nexx360BidderTest.java
+++ b/src/test/java/org/prebid/server/bidder/nexx360/Nexx360BidderTest.java
@@ -28,6 +28,7 @@
 import java.math.BigDecimal;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Map;
 import java.util.function.UnaryOperator;
 
 import static java.util.Collections.singletonList;
@@ -133,6 +134,30 @@ public void makeHttpRequestsShouldModifyImpExt() {
                 .containsExactly(expectedExt1, expectedExt2);
     }
 
+    @Test
+    public void makeHttpRequestsShouldPreserveCustomFieldsInImpExt() {
+        // given
+        final BidRequest bidRequest = givenBidRequest(
+                imp -> imp.id("imp1").ext(mapper.valueToTree(Map.of(
+                        "bidder", ExtImpNexx360.of("tag1", "p1"),
+                        "customField", "customValue"))));
+
+        // when
+        final Result<List<HttpRequest<BidRequest>>> result = target.makeHttpRequests(bidRequest);
+
+        // then
+        final ObjectNode expectedExt = mapper.valueToTree(Map.of(
+                "nexx360", ExtImpNexx360.of("tag1", "p1"),
+                "customField", "customValue"));
+
+        assertThat(result.getErrors()).isEmpty();
+        assertThat(result.getValue()).hasSize(1)
+                .extracting(HttpRequest::getPayload)
+                .flatExtracting(BidRequest::getImp)
+                .extracting(Imp::getExt)
+                .containsExactly(expectedExt);
+    }
+
     @Test
     public void makeHttpRequestsShouldModifyRequestExt() {
         // given
diff --git a/src/test/resources/org/prebid/server/it/openrtb2/easybid/test-easybid-bid-request.json b/src/test/resources/org/prebid/server/it/openrtb2/easybid/test-easybid-bid-request.json
index a6a87d4012c..94c35c9da4d 100644
--- a/src/test/resources/org/prebid/server/it/openrtb2/easybid/test-easybid-bid-request.json
+++ b/src/test/resources/org/prebid/server/it/openrtb2/easybid/test-easybid-bid-request.json
@@ -9,6 +9,7 @@
       },
       "secure": 1,
       "ext": {
+        "tid": "${json-unit.any-string}",
         "nexx360": {
           "placement": "placement"
         }
diff --git a/src/test/resources/org/prebid/server/it/openrtb2/nexx360/test-nexx360-bid-request.json b/src/test/resources/org/prebid/server/it/openrtb2/nexx360/test-nexx360-bid-request.json
index a6a87d4012c..94c35c9da4d 100644
--- a/src/test/resources/org/prebid/server/it/openrtb2/nexx360/test-nexx360-bid-request.json
+++ b/src/test/resources/org/prebid/server/it/openrtb2/nexx360/test-nexx360-bid-request.json
@@ -9,6 +9,7 @@
       },
       "secure": 1,
       "ext": {
+        "tid": "${json-unit.any-string}",
         "nexx360": {
           "placement": "placement"
         }
diff --git a/src/test/resources/org/prebid/server/it/openrtb2/oneaccord/test-1accord-bid-request.json b/src/test/resources/org/prebid/server/it/openrtb2/oneaccord/test-1accord-bid-request.json
index a6a87d4012c..94c35c9da4d 100644
--- a/src/test/resources/org/prebid/server/it/openrtb2/oneaccord/test-1accord-bid-request.json
+++ b/src/test/resources/org/prebid/server/it/openrtb2/oneaccord/test-1accord-bid-request.json
@@ -9,6 +9,7 @@
       },
       "secure": 1,
       "ext": {
+        "tid": "${json-unit.any-string}",
         "nexx360": {
           "placement": "placement"
         }
diff --git a/src/test/resources/org/prebid/server/it/openrtb2/prismassp/test-prismassp-bid-request.json b/src/test/resources/org/prebid/server/it/openrtb2/prismassp/test-prismassp-bid-request.json
index a6a87d4012c..94c35c9da4d 100644
--- a/src/test/resources/org/prebid/server/it/openrtb2/prismassp/test-prismassp-bid-request.json
+++ b/src/test/resources/org/prebid/server/it/openrtb2/prismassp/test-prismassp-bid-request.json
@@ -9,6 +9,7 @@
       },
       "secure": 1,
       "ext": {
+        "tid": "${json-unit.any-string}",
         "nexx360": {
           "placement": "placement"
         }