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, updateCount] = useState(0);
        _updateCount = updateCount;
        useEffect(() => {
          expect(SchedulerTracing.unstable_getCurrent()).toMatchInteractions([
            tracingEvent,
          ]);
          Scheduler.unstable_yieldValue(`Will set count to 1`);
          updateCount(1);
        }, []);
        return <Text text={'Count: ' + count} />;
      }
      const tracingEvent = {id: 0, name: 'hello', timestamp: 0};
      
      
      expect(() => {
        SchedulerTracing.unstable_trace(
          tracingEvent.name,
          tracingEvent.timestamp,
          () => {
            ReactNoop.render(<Counter count={0} />, () =>
              Scheduler.unstable_yieldValue('Sync effect'),
            );
          },