diff --git a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts
index e2baec9..5b48345 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts
@@ -1120,12 +1120,10 @@
       return;
     }
 
-    this._change = undefined;
     this._files = {sortedFileList: [], changeFilesByPath: {}};
     this._path = undefined;
     this._patchRange = undefined;
     this._commitRange = undefined;
-    this._changeComments = undefined;
     this._focusLineNum = undefined;
 
     if (value.changeNum && value.project) {
@@ -1156,8 +1154,9 @@
       })
     );
 
-    promises.push(this._getChangeDetail(this._changeNum));
-    this._loadComments(value.patchNum);
+    if (!this._change) promises.push(this._getChangeDetail(this._changeNum));
+
+    if (!this._changeComments) this._loadComments(value.patchNum);
 
     promises.push(this._getChangeEdit());
 
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.js b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.js
index 735624a..2c4750a 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.js
@@ -29,6 +29,7 @@
 } from '../../../test/test-data-generators.js';
 import {EditPatchSetNum} from '../../../types/common.js';
 import {CursorMoveResult} from '../../../api/core.js';
+import {EventType} from '../../../types/events.js';
 
 const basicFixture = fixtureFromElement('gr-diff-view');
 
@@ -323,6 +324,60 @@
       assert.equal(element._isFileUnchanged(diff), true);
     });
 
+    test('change detail is not rerequested if changeNum doesnt change',
+        async () => {
+          const dispatchEventStub = sinon.stub(element, 'dispatchEvent');
+          assert.isFalse(getDiffChangeDetailStub.called);
+          sinon.stub(element.reporting, 'diffViewDisplayed');
+          sinon.stub(element, '_loadBlame');
+          sinon.stub(element.$.diffHost, 'reload').returns(Promise.resolve());
+          sinon.spy(element, '_paramsChanged');
+          element._change = undefined;
+          getDiffChangeDetailStub.returns(
+              Promise.resolve({
+                ...createChange(),
+                revisions: createRevisions(11),
+              }));
+          element._patchRange = {
+            patchNum: 2,
+            basePatchNum: 1,
+          };
+          sinon.stub(element, '_isFileUnchanged').returns(false);
+
+          element.params = {
+            view: GerritNav.View.DIFF,
+            changeNum: '42',
+            project: 'p',
+            commentId: 'c1',
+            commentLink: true,
+          };
+          await element._paramsChanged.returnValues[0];
+
+          assert.equal(getDiffChangeDetailStub.callCount, 1);
+          element.params = {
+            view: GerritNav.View.DIFF,
+            changeNum: '42',
+            project: 'p',
+            commentId: 'c1',
+            commentLink: true,
+          };
+          await element._paramsChanged.returnValues[0];
+
+          assert.equal(getDiffChangeDetailStub.callCount, 1);
+          element.params = {
+            view: GerritNav.View.DIFF,
+            changeNum: '43',
+            project: 'p',
+            commentId: 'c1',
+            commentLink: true,
+          };
+          await element._paramsChanged.returnValues[0];
+
+          // change page is recreated now
+          assert.equal(dispatchEventStub.lastCall.args[0].type,
+              EventType.RECREATE_DIFF_VIEW);
+        });
+
     test('diff toast to go to latest is shown and not base', async () => {
       diffCommentsStub.returns(Promise.resolve({
         '/COMMIT_MSG': [
@@ -344,6 +399,7 @@
       sinon.stub(element, '_loadBlame');
       sinon.stub(element.$.diffHost, 'reload').returns(Promise.resolve());
       sinon.spy(element, '_paramsChanged');
+      element._change = undefined;
       getDiffChangeDetailStub.returns(
           Promise.resolve({
             ...createChange(),