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 tag = fiber.tag;
    if (
      tag !== IndeterminateComponent &&
      tag !== HostRoot &&
      tag !== ClassComponent &&
      tag !== FunctionComponent &&
      tag !== ForwardRef &&
      tag !== MemoComponent &&
      tag !== SimpleMemoComponent
    ) {
       O
      return;
    }
     W
     t
    const componentName = getComponentNameFromFiber(fiber) || 'ReactComponent';
    if (didWarnStateUpdateForNotYetMountedComponent !== null) {
      if (didWarnStateUpdateForNotYetMountedComponent.has(componentName)) {
        return;
      }
      didWarnStateUpdateForNotYetMountedComponent.add(componentName);
    } else {
      didWarnStateUpdateForNotYetMountedComponent = new Set([componentName]);
    }
    const previousFiber = ReactCurrentFiberCurrent;
    try {
      setCurrentDebugFiberInDEV(fiber);
      console.error(
        "Can't perform a React state update on a component that hasn't mounted yet. " +