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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
return 'Done';
    }
    const renderer = ReactTestRenderer.create(
      <div>
        <React.Suspense fallback={'Loading'}>
          <MyComponent />
        </React.Suspense>
      </div>,
      {unstable_isConcurrent: true},
    );
    expect(Scheduler).toFlushAndYield([]);
    
    jest.advanceTimersByTime(1000);
    const fiber = renderer.root._currentFiber().child;
    if (__DEV__) {