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
IdlePriority as IdleSchedulerPriority,
} from './Scheduler';
import {
  flushSyncCallbacks,
  flushSyncCallbacksOnlyInLegacyMode,
  scheduleSyncCallback,
  scheduleLegacySyncCallback,
} from './ReactFiberSyncTaskQueue.old';
import {
  logCommitStarted,
  logCommitStopped,
  logLayoutEffectsStarted,
  logLayoutEffectsStopped,
  logPassiveEffectsStarted,
  logPassiveEffectsStopped,
  logRenderStarted,
  logRenderStopped,
} from './DebugTracing';
import {
  resetAfterCommit,
  scheduleTimeout,
  cancelTimeout,
  noTimeout,
  afterActiveInstanceBlur,
  getCurrentEventPriority,
  supportsMicrotasks,
  errorHydratingContainer,
  scheduleMicrotask,
} from './ReactFiberHostConfig';
import {