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
getHighestPriorityLane,
  addFiberToLanesMap,
  movePendingFibersToMemoized,
  addTransitionToLanesMap,
  getTransitionsForLanes,
} from './ReactFiberLane.new';
import {
  DiscreteEventPriority,
  ContinuousEventPriority,
  DefaultEventPriority,
  IdleEventPriority,
  getCurrentUpdatePriority,
  setCurrentUpdatePriority,
  lowerEventPriority,
  lanesToEventPriority,
} from './ReactEventPriorities.new';
import {requestCurrentTransition, NoTransition} from './ReactFiberTransition';
import {beginWork as originalBeginWork} from './ReactFiberBeginWork.new';
import {completeWork} from './ReactFiberCompleteWork.new';
import {unwindWork, unwindInterruptedWork} from './ReactFiberUnwindWork.new';
import {
  throwException,
  createRootErrorUpdate,
  createClassErrorUpdate,
} from './ReactFiberThrow.new';
import {
  commitBeforeMutationEffects,
  commitLayoutEffects,
  commitMutationEffects,
  commitPassiveEffectDurations,