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
const isTransition = requestCurrentTransition() !== NoTransition;
  if (isTransition) {
    if (__DEV__ && ReactCurrentBatchConfig.transition !== null) {
      const transition = ReactCurrentBatchConfig.transition;
      if (!transition._updatedFibers) {
        transition._updatedFibers = new Set();
      }
      transition._updatedFibers.add(fiber);
    }
    
    
    
    
    
    
    
    if (currentEventTransitionLane === NoLane) {
      
      currentEventTransitionLane = claimNextTransitionLane();
    }
    return currentEventTransitionLane;
  }
  
  
  
  
  
  
  const updateLane: Lane = (getCurrentUpdatePriority(): any);
  if (updateLane !== NoLane) {