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 renderWasConcurrent = !includesBlockingLane(root, lanes);
      const finishedWork: Fiber = (root.current.alternate: any);
      if (
        renderWasConcurrent &&
        !isRenderConsistentWithExternalStores(finishedWork)
      ) {
         
         
        exitStatus = renderRootSync(root, lanes);
         
        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;