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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
await advanceTimers(1100);
        
        expect(ReactNoop.getChildren()).toEqual([
          hiddenSpan('A'),
          span('Loading...'),
        ]);
      });
      
      Scheduler.unstable_advanceTime(3000);
      await advanceTimers(3000);
      expect(Scheduler).toHaveYielded(['Promise resolved [B]']);
      expect(Scheduler).toFlushAndYield(['B']);
      expect(ReactNoop.getChildren()).toEqual([span('B')]);
    });
  });
  it('disables suspense config when nothing is passed to withSuspenseConfig', async () => {
    function App({page}) {
      return (
        <Suspense fallback={<Text text="Loading..." />}>
          <AsyncText text={page} ms={2000} />
        </Suspense>
      );
    }
    
    ReactNoop.render(<App page="A" />);
    expect(Scheduler).toFlushAndYield(['Suspend! [A]', 'Loading...']);
    Scheduler.unstable_advanceTime(2000);
    await advanceTimers(2000);
    expect(Scheduler).toHaveYielded(['Promise resolved [A]']);
    expect(Scheduler).toFlushAndYield(['A']);