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.
ReactNoop.flushDiscreteUpdates();
      ReactNoop.discreteUpdates(() => {
        
        ReactNoop.batchedUpdates(() => {
          _updateCount(2);
        });
      });
      expect(Scheduler).toHaveYielded(['Will set count to 1']);
      expect(() => {
        expect(Scheduler).toFlushAndYield(['Count: 2']);
      }).toErrorDev([
        'An update to Counter ran an effect',
        'An update to Counter ran an effect',
      ]);
      expect(ReactNoop.getChildren()).toEqual([span('Count: 2')]);
    });
    it('flushes passive effects when flushing discrete updates (with tracing)', () => {
      const onInteractionScheduledWorkCompleted = jest.fn();
      const onWorkCanceled = jest.fn();
      SchedulerTracing.unstable_subscribe({
        onInteractionScheduledWorkCompleted,
        onInteractionTraced: jest.fn(),
        onWorkCanceled,
        onWorkScheduled: jest.fn(),
        onWorkStarted: jest.fn(),
        onWorkStopped: jest.fn(),
      });
      let _updateCount;
      function Counter(props) {