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
Never force flush in production. This function should get stripped out.
  return __DEV__ && ReactCurrentActQueue.current !== null;
}
function warnIfUpdatesNotWrappedWithActDEV(fiber: Fiber): void {
  if (__DEV__) {
    if (fiber.mode & ConcurrentMode) {
      if (!isConcurrentActEnvironment()) {
         N
        return;
      }
    } else {
       L
      if (!isLegacyActEnvironment(fiber)) {
         N
        return;
      }
      if (executionContext !== NoContext) {
         L
         b
        return;
      }
      if (
        fiber.tag !== FunctionComponent &&
        fiber.tag !== ForwardRef &&
        fiber.tag !== SimpleMemoComponent
      ) {
         F
         w
        return;
      }