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);
        if (count < 12) {
          setCount(c => c + 1);
          setCount(c => c + 1);
          setCount(c => c + 1);
        }
        Scheduler.unstable_yieldValue('Render: ' + count);
        return <Text text={count} />;
      }
      ReactNoop.render(<Counter />);
      expect(Scheduler).toFlushAndYield([
        
        'Render: 0',
        'Render: 3',
        'Render: 6',
        'Render: 9',
        'Render: 12',
        12,
      ]);
      expect(ReactNoop.getChildren()).toEqual([span(12)]);
    });
    it('throws after too many iterations', () => {
      function Counter({row: newRow}) {