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 (exitStatus !== RootInProgress) {
    if (exitStatus === RootErrored) {
       
       
       
       
      const errorRetryLanes = getLanesToRetrySynchronouslyOnError(root);
      if (errorRetryLanes !== NoLanes) {
        lanes = errorRetryLanes;
        exitStatus = recoverFromConcurrentError(root, errorRetryLanes);
      }
    }
    if (exitStatus === RootFatalErrored) {
      const fatalError = workInProgressRootFatalError;
      prepareFreshStack(root, NoLanes);
      markRootSuspended(root, lanes);
      ensureRootIsScheduled(root, now());
      throw fatalError;
    }
    if (exitStatus === RootDidNotComplete) {
       
       
       
      
       
       
       
      markRootSuspended(root, lanes);
    } else {