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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
return (
        <Suspense fallback={<TextWithLifecycle text="Loading..." />}>
          <TextWithLifecycle text="A" />
          <AsyncTextWithLifecycle ms={100} text="B" />
          <TextWithLifecycle text="C" />
        </Suspense>
      );
    }
    ReactNoop.renderLegacySyncRoot(<App />, () =>
      Scheduler.unstable_yieldValue('Commit root'),
    );
    expect(Scheduler).toHaveYielded([
      'A',
      'Suspend! [B]',
      'C',
      'Loading...',
      'Mount [A]',
      
      
      'Mount [C]',