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
Returns whether passive effects were flushed.
   TODO: Combine this check with the one in flushPassiveEFfectsImpl. We should
   probably just combine the two functions. I believe they were only separate
   in the first place because we used to wrap it with
   `Scheduler.runWithPriority`, which accepts a function. But now we track the
   priority within React itself, so we can mutate the variable directly.
  if (rootWithPendingPassiveEffects !== null) {
     C
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    const root = rootWithPendingPassiveEffects;
     C
     m
     w
    const remainingLanes = pendingPassiveEffectsRemainingLanes;
    pendingPassiveEffectsRemainingLanes = NoLanes;
    const renderPriority = lanesToEventPriority(pendingPassiveEffectsLanes);
    const priority = lowerEventPriority(DefaultEventPriority, renderPriority);