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 text = `${props.label}: ${props.count}`;
        useEffect(() => {
          Scheduler.unstable_yieldValue(`Did create [${text}]`);
          return () => {
            Scheduler.unstable_yieldValue(`Did destroy [${text}]`);
          };
        }, [props.label, props.count]);
        return <Text text={text} />;
      }
      act(() => {
        ReactNoop.render(<Counter label="Count" count={0} />, () =>
          Scheduler.unstable_yieldValue('Sync effect'),
        );
        expect(Scheduler).toFlushAndYieldThrough(['Count: 0', 'Sync effect']);
      });
      expect(Scheduler).toHaveYielded(['Did create [Count: 0]']);
      expect(ReactNoop.getChildren()).toEqual([span('Count: 0')]);
      act(() => {
        ReactNoop.render(<Counter label="Count" count={1} />, () =>
          Scheduler.unstable_yieldValue('Sync effect'),
        );
        
        expect(Scheduler).toFlushAndYieldThrough(['Count: 1', 'Sync effect']);