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
cancelCallback(existingCallbackNode);
    }
    root.callbackNode = null;
    root.callbackPriority = NoLane;
    return;
  }
   
  const newCallbackPriority = getHighestPriorityLane(nextLanes);
   
  const existingCallbackPriority = root.callbackPriority;
  if (
    existingCallbackPriority === newCallbackPriority &&
     
     
     
    !(
      __DEV__ &&
      ReactCurrentActQueue.current !== null &&
      existingCallbackNode !== fakeActCallbackNode
    )
  ) {
    if (__DEV__) {