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
root: FiberRoot,
  recoverableErrors: null | Array<mixed>,
  transitions: Array<Transition> | null,
) {
   
   
  const previousUpdateLanePriority = getCurrentUpdatePriority();
  const prevTransition = ReactCurrentBatchConfig.transition;
  try {
    ReactCurrentBatchConfig.transition = null;
    setCurrentUpdatePriority(DiscreteEventPriority);
    commitRootImpl(
      root,
      recoverableErrors,
      transitions,
      previousUpdateLanePriority,
    );
  } finally {
    ReactCurrentBatchConfig.transition = prevTransition;
    setCurrentUpdatePriority(previousUpdateLanePriority);
  }
  return null;
}
function commitRootImpl(
  root: FiberRoot,
  recoverableErrors: null | Array<mixed>,
  transitions: Array<Transition> | null,
  renderPriorityLevel: EventPriority,
) {
  do {