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
model where we don't commit new loading states in too quick succession.
let globalMostRecentFallbackTime: number = 0;
const FALLBACK_THROTTLE_MS: number = 500;
 The absolute time for when we should start giving up on rendering
 more and prefer CPU suspense heuristics instead.
let workInProgressRootRenderTargetTime: number = Infinity;
 How long a render is supposed to take before we start following CPU
 suspense heuristics and opt out of rendering more content.
const RENDER_TIMEOUT_MS = 500;
let workInProgressTransitions: Array<Transition> | null = null;
export function getWorkInProgressTransitions() {
  return workInProgressTransitions;
}
let currentPendingTransitionCallbacks: PendingTransitionCallbacks | null = null;
export function addTransitionStartCallbackToPendingTransition(
  transition: TransitionObject,
) {
  if (enableTransitionTracing) {
    if (currentPendingTransitionCallbacks === null) {
      currentPendingTransitionCallbacks = {
        transitionStart: [],
        transitionComplete: null,
      };
    }
    if (currentPendingTransitionCallbacks.transitionStart === null) {
      currentPendingTransitionCallbacks.transitionStart = [];
    }
    currentPendingTransitionCallbacks.transitionStart.push(transition);
  }
}