fixes #28639

src/vs/workbench/parts/debug/electron-browser/debugViewer.ts

@@ -373,7 +373,7 @@ export class CallStackDataSource implements IDataSource {
 		}
 
 		return callStackPromise.then(() => {
-			if (callStack.length === 1) {
+			if (callStack.length === 1 && thread.process.session.capabilities.supportsDelayedStackTraceLoading) {
 				// To reduce flashing of the call stack view simply append the stale call stack
 				// once we have the correct data the tree will refresh and we will no longer display it.
 				callStack = callStack.concat(thread.getStaleCallStack().slice(1));