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
if (fn) {
      return fn();
    } else {
      return undefined;
    }
  } finally {
    setCurrentUpdatePriority(previousPriority);
    ReactCurrentBatchConfig.transition = prevTransition;
    executionContext = prevExecutionContext;
     
     
     
    if ((executionContext & (RenderContext | CommitContext)) === NoContext) {
      flushSyncCallbacks();
    }
  }
}
export function isAlreadyRendering() {
   
   
  return (
    __DEV__ &&
    (executionContext & (RenderContext | CommitContext)) !== NoContext
  );
}
export function flushControlled(fn: () => mixed): void {
  const prevExecutionContext = executionContext;
  executionContext |= BatchedContext;
  const prevTransition = ReactCurrentBatchConfig.transition;
  const previousPriority = getCurrentUpdatePriority();