diff --git a/src/vs/workbench/contrib/chat/browser/chatEditing/chatEditingModifiedNotebookEntry.ts b/src/vs/workbench/contrib/chat/browser/chatEditing/chatEditingModifiedNotebookEntry.ts
index a547adb37a649..83707965b08e1 100644
--- a/src/vs/workbench/contrib/chat/browser/chatEditing/chatEditingModifiedNotebookEntry.ts
+++ b/src/vs/workbench/contrib/chat/browser/chatEditing/chatEditingModifiedNotebookEntry.ts
@@ -79,7 +79,6 @@ export class ChatEditingModifiedNotebookEntry extends AbstractChatEditingModifie
 	private readonly cellEntryMap = new ResourceMap<ChatEditingNotebookCellEntry>();
 	private modifiedToOriginalCell = new ResourceMap<URI>();
 	private readonly _cellsDiffInfo = observableValue<ICellDiffInfo[]>('diffInfo', []);
-	private readonly _maxModifiedLineNumbers = observableValue<number[]>('changedMaxLineNumber', []);
 
 	get cellsDiffInfo(): IObservable<ICellDiffInfo[]> {
 		return this._cellsDiffInfo;
@@ -182,7 +181,6 @@ export class ChatEditingModifiedNotebookEntry extends AbstractChatEditingModifie
 		this.originalModel = this._register(originalResourceRef).object.notebook;
 		this.originalURI = this.originalModel.uri;
 		this.initialContent = initialContent;
-		this._maxModifiedLineNumbers.set(this.modifiedModel.cells.map(() => 0), undefined);
 		this.initializeModelsFromDiff();
 		this._register(this.modifiedModel.onDidChangeContent(this.mirrorNotebookEdits, this));
 	}
@@ -514,7 +512,8 @@ export class ChatEditingModifiedNotebookEntry extends AbstractChatEditingModifie
 			if (!isLastEdits) {
 				this._stateObs.set(WorkingSetEntryState.Modified, tx);
 				this._isCurrentlyBeingModifiedByObs.set(responseModel, tx);
-				this._rewriteRatioObs.set(Math.min(1, calculateNotebookRewriteRatio(this._cellsDiffInfo.get(), this.originalModel, this.modifiedModel)), tx);
+				const newRewriteRation = Math.max(this._rewriteRatioObs.get(), calculateNotebookRewriteRatio(this._cellsDiffInfo.get(), this.originalModel, this.modifiedModel));
+				this._rewriteRatioObs.set(Math.min(1, newRewriteRation), tx);
 
 			} else {
 				finishPreviousCells();
@@ -891,13 +890,9 @@ export class ChatEditingModifiedNotebookEntry extends AbstractChatEditingModifie
 				};
 			}
 			diffs.splice(entryIndex, 1, { ...entry });
-			const maxModifiedLineNumber = cellEntry.maxModifiedLineNumber.read(r);
-			const maxModifiedLineNumbers = this._maxModifiedLineNumbers.get().slice();
-			maxModifiedLineNumbers[index] = maxModifiedLineNumber;
 
 			transaction(tx => {
 				this.updateCellDiffInfo(diffs, tx);
-				this._maxModifiedLineNumbers.set(maxModifiedLineNumbers, tx);
 			});
 		}));