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 [state, setState] = React.useState(0);
      return (
        <div
          ref={() => {
            if (!ran) {
              ran = true;
              setState(1);
              simulateSafariBug();
            }
          }}>
          {state}
        </div>
      );
    }
    const root = ReactDOMClient.createRoot(container);
    await act(async () => {
      root.render(<Foo />);
    });
    expect(container.textContent).toBe('1');
  });
});