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={<Spinner />}>
            <UpdatingText ref={text} />
            <Text text="Sibling" />
          </Suspense>
        );
      }
      
      ReactNoop.renderLegacySyncRoot(<App />);
      await advanceTimers(100);
      expect(Scheduler).toHaveYielded([
        'Suspend! [Step: 1]',
        'Sibling',
        'Loading (1)',
        'Loading (2)',
        'Loading (3)',
        'Promise resolved [Step: 1]',
      ]);
      expect(Scheduler).toFlushExpired(['Step: 1']);
      expect(ReactNoop).toMatchRenderedOutput(
        <>
          <span prop="Step: 1" />
          <span prop="Sibling" />
        </>,
      );
      
      text.current.setState({step: 2}, () =>