diff --git a/src/vs/workbench/contrib/notebook/browser/diff/diffElementViewModel.ts b/src/vs/workbench/contrib/notebook/browser/diff/diffElementViewModel.ts
index 9d0cf11b51596..ad8e1461fa3b2 100644
--- a/src/vs/workbench/contrib/notebook/browser/diff/diffElementViewModel.ts
+++ b/src/vs/workbench/contrib/notebook/browser/diff/diffElementViewModel.ts
@@ -222,7 +222,7 @@ export abstract class DiffElementCellViewModelBase extends DiffElementViewModelB
 			layoutState: CellLayoutState.Uninitialized
 		};
 
-		this.cellFoldingState = modified?.textModel?.getValue() !== original?.textModel?.getValue() ? PropertyFoldingState.Expanded : PropertyFoldingState.Collapsed;
+		this.cellFoldingState = modified?.getTextBufferHash() !== original?.getTextBufferHash() ? PropertyFoldingState.Expanded : PropertyFoldingState.Collapsed;
 		this.metadataFoldingState = PropertyFoldingState.Collapsed;
 		this.outputFoldingState = PropertyFoldingState.Collapsed;