Repro: https://codesandbox.io/s/fast-water-4i4jb

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
Scheduler.unstable_yieldValue('Offscreen');
      return 'Offscreen';
    }
    function App({showContent}) {
      React.useLayoutEffect(() => {
        Scheduler.unstable_yieldValue('Commit');
      });
      return (
        <>
          <div hidden={true}>
            <Offscreen />
          </div>
          <Suspense fallback={<Text text="Loading..." />}>
            {showContent ? <AsyncText text="A" ms={2000} /> : null}
          </Suspense>
        </>
      );
    }
    
    ReactNoop.render(<App showContent={false} />);