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 [counter, setCounter] = useState(0);
      setCounterA = setCounter;
      Scheduler.unstable_yieldValue('Render A: ' + counter);
      useEffect(() => {
        Scheduler.unstable_yieldValue('Commit A: ' + counter);
      });
      return counter;
    }
    function CounterB() {
      const [counter, setCounter] = useState(0);
      setCounterB = setCounter;
      Scheduler.unstable_yieldValue('Render B: ' + counter);
      useEffect(() => {
        Scheduler.unstable_yieldValue('Commit B: ' + counter);
      });
      return counter;
    }
    const root = ReactNoop.createRoot(null);
    await ReactNoop.act(async () => {
      root.render(
        <>
          <CounterA />
          <CounterB />