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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
await ReactNoop.act(async () => {
      transitionToPage('C');
      
      
      Scheduler.unstable_advanceTime(600);
      await advanceTimers(600);
      expect(Scheduler).toFlushAndYield(['B', 'L', 'C']);
      
      
      
      expect(ReactNoop.getChildren()).toEqual([span('B'), span('L')]);
      Scheduler.unstable_advanceTime(400);
      await advanceTimers(400);
      expect(ReactNoop.getChildren()).toEqual([span('C')]);
    });
    await ReactNoop.act(async () => {
      transitionToPage('D');
      
      
      Scheduler.unstable_advanceTime(1000);
      await advanceTimers(1000);
      expect(Scheduler).toFlushAndYield(['C', 'L', 'D']);
      
      
      expect(ReactNoop.getChildren()).toEqual([span('D')]);
    });
  });
  it("suspended commit remains suspended even if there's another update at same expiration", async () => {
    
    function App({text}) {