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
createWorkInProgress,
  assignFiberPropertiesInDEV,
} from './ReactFiber.new';
import {isRootDehydrated} from './ReactFiberShellHydration';
import {didSuspendOrErrorWhileHydratingDEV} from './ReactFiberHydrationContext.new';
import {NoMode, ProfileMode, ConcurrentMode} from './ReactTypeOfMode';
import {
  HostRoot,
  IndeterminateComponent,
  ClassComponent,
  SuspenseComponent,
  SuspenseListComponent,
  FunctionComponent,
  ForwardRef,
  MemoComponent,
  SimpleMemoComponent,
  Profiler,
} from './ReactWorkTags';
import {LegacyRoot} from './ReactRootTags';
import {
  NoFlags,
  Placement,
  Incomplete,
  StoreConsistency,
  HostEffectMask,
  Hydrating,
  ForceClientRender,
  BeforeMutationMask,
  MutationMask,
  LayoutMask,