Batched state changes are not flushed if the promise code changes the DOM (= attaching an iframe). Reproduceable with Safari.

React version: 18.1.0

## Steps To Reproduce

1. Open [codepen](https://codepen.io/kh-viewar/pen/wvpVLxM) with Safari.
2. Click "Upload"
3. => "Spinner" text does not render while Promise is in pending

Link to code example:

https://codepen.io/kh-viewar/pen/wvpVLxM

## The current behavior

State changes are not executed.

## The expected behavior

State should change to true and render spinner component. After promise is resolved (2 seconds timeout), state should switch back to false and spinner component should unmount.

## Original discussion

https://github.com/facebook/react/issues/24365
return null;
}
export function flushRoot(root: FiberRoot, lanes: Lanes) {
  if (lanes !== NoLanes) {
    markRootEntangled(root, mergeLanes(lanes, SyncLane));
    ensureRootIsScheduled(root, now());
    if ((executionContext & (RenderContext | CommitContext)) === NoContext) {
      resetRenderTimer();
      flushSyncCallbacks();
    }
  }
}
export function getExecutionContext(): ExecutionContext {
  return executionContext;
}
export function deferredUpdates<A>(fn: () => A): A {
  const previousPriority = getCurrentUpdatePriority();
  const prevTransition = ReactCurrentBatchConfig.transition;
  try {
    ReactCurrentBatchConfig.transition = null;
    setCurrentUpdatePriority(DefaultEventPriority);
    return fn();
  } finally {
    setCurrentUpdatePriority(previousPriority);
    ReactCurrentBatchConfig.transition = prevTransition;
  }
}
export function batchedUpdates<A, R>(fn: A => R, a: A): R {
  const prevExecutionContext = executionContext;
  executionContext |= BatchedContext;