don't stringify tt before applying it, https://github.com/microsoft/vscode/issues/106396

src/vs/workbench/contrib/notebook/browser/view/renderers/cellRenderer.ts

@@ -647,7 +647,7 @@ class CodeCellDragImageRenderer {
 			return null;
 		}
 
-		editorContainer.innerHTML = String(richEditorText);
+		editorContainer.innerHTML = richEditorText as unknown as string;
 
 		return dragImageContainer;
 	}