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
prepareFreshStack(root, lanes);
  }
  if (__DEV__) {
    if (enableDebugTracing) {
      logRenderStarted(lanes);
    }
  }
  if (enableSchedulingProfiler) {
    markRenderStarted(lanes);
  }
  do {
    try {
      workLoopSync();
      break;
    } catch (thrownValue) {
      handleError(root, thrownValue);
    }
  } while (true);
  resetContextDependencies();
  executionContext = prevExecutionContext;
  popDispatcher(prevDispatcher);
  if (workInProgress !== null) {
     
    throw new Error(
      'Cannot commit an incomplete root. This error is likely caused by a ' +
        'bug in React. Please file an issue.',
    );
  }
  if (__DEV__) {
    if (enableDebugTracing) {