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.
expect(ReactNoop.getChildren()).toEqual([span('Count: 1')]);
      });
      expect(Scheduler).toHaveYielded([
        'Did destroy [Count: 0]',
        'Did create [Count: 1]',
      ]);
      act(() => {
        ReactNoop.render(<Counter label="Count" count={1} />, () =>
          Scheduler.unstable_yieldValue('Sync effect'),
        );
        
        expect(Scheduler).toFlushAndYieldThrough(['Count: 1', 'Sync effect']);
      });
      expect(Scheduler).toHaveYielded([]);
      expect(ReactNoop.getChildren()).toEqual([span('Count: 1')]);
      act(() => {
        ReactNoop.render(<Counter label="Total" count={1} />, () =>
          Scheduler.unstable_yieldValue('Sync effect'),
        );
        
        expect(Scheduler).toFlushAndYieldThrough(['Total: 1', 'Sync effect']);
        expect(ReactNoop.getChildren()).toEqual([span('Total: 1')]);
      });
      expect(Scheduler).toHaveYielded([
        'Did destroy [Count: 1]',
        'Did create [Total: 1]',
      ]);
    });
    it('multiple effects', () => {
      function Counter(props) {