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 [, updateCount] = useState(0);
        _updateCount = updateCount;
        return null;
      }
      ReactNoop.render(<Counter />);
      expect(Scheduler).toFlushWithoutYielding();
      ReactNoop.render(null);
      expect(Scheduler).toFlushWithoutYielding();
      expect(() => act(() => _updateCount(1))).toErrorDev(
        "Warning: Can't perform a React state update on an unmounted " +
          'component. This is a no-op, but it indicates a memory leak in your ' +
          'application. To fix, cancel all subscriptions and asynchronous ' +
          'tasks in a useEffect cleanup function.\n' +
          '    in Counter (at **)',
      );
    });
    it('dedupes the warning by component name', () => {
      let _updateCountA;
      function CounterA(props, ref) {
        const [, updateCount] = useState(0);
        _updateCountA = updateCount;
        return null;
      }
      let _updateCountB;
      function CounterB(props, ref) {