Sandbox: https://codesandbox.io/s/cranky-kapitsa-op3jh

Repro: type "a" and then after a second "b"

Expected: Eventually you'll see "ab" in all fields. Pending "..." indicator goes away.

Actual: You'll keep seeing "a" in low pri field. Pending "..." indicator is stuck.
const [count, setCount] = useState(0);
        useLayoutEffect(() => {
          
          if (count === 0) {
            setCount(1);
          }
          Scheduler.unstable_yieldValue('Layout effect ' + count);
        });
        return <Text text="Layout" />;
      }
      ReactNoop.render([<PassiveEffect key="p" />, <LayoutEffect key="l" />]);
      act(() => {
        expect(Scheduler).toFlushAndYield([
          'Passive',
          'Layout',
          'Layout effect 0',
          'Passive effect',
          'Layout',
          'Layout effect 1',
        ]);
      });
      expect(ReactNoop.getChildren()).toEqual([
        span('Passive'),
        span('Layout'),
      ]);
    });
    it('flushes passive effects even if siblings schedule a new root', () => {
      function PassiveEffect(props) {