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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
const [text, _setText] = useState('Loading...');
        setFallbackText = _setText;
        return <Text text={text} />;
      }
      
      await resolveText('A');
      await ReactNoop.act(async () => {
        root.render(<App />);
      });
      expect(Scheduler).toHaveYielded(['A']);
      expect(root).toMatchRenderedOutput(<span prop="A" />);
      
      await ReactNoop.act(async () => {
        setAppText('B');
      });
      expect(Scheduler).toHaveYielded(['Suspend! [B]', 'Loading...']);
      
      await advanceTimers(250);
      expect(root).toMatchRenderedOutput(
        <>
          <span hidden={true} prop="A" />
          <span prop="Loading..." />
        </>,
      );
      
      
      
      await ReactNoop.act(async () => {