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.
expect(ReactNoop.getChildren()).toEqual([span('Count: (empty)')]);
        expect(Scheduler).toFlushAndYieldThrough(['Sync effect']);
        expect(ReactNoop.getChildren()).toEqual([span('Count: 0')]);
        ReactNoop.flushPassiveEffects();
        expect(Scheduler).toHaveYielded(['Schedule update [1]']);
        expect(Scheduler).toFlushAndYield(['Count: 1']);
        expect(ReactNoop.getChildren()).toEqual([span('Count: 1')]);
      });
    });
    it('flushes passive effects when flushing discrete updates', () => {
      let _updateCount;
      function Counter(props) {
        const [count, updateCount] = useState(0);
        _updateCount = updateCount;
        useEffect(() => {
          Scheduler.unstable_yieldValue(`Will set count to 1`);
          updateCount(1);
        }, []);
        return <Text text={'Count: ' + count} />;
      }
      
      
      expect(() => {
        ReactNoop.render(<Counter count={0} />, () =>
          Scheduler.unstable_yieldValue('Sync effect'),
        );
        expect(Scheduler).toFlushAndYieldThrough(['Count: 0', 'Sync effect']);
        expect(ReactNoop.getChildren()).toEqual([span('Count: 0')]);
      }).toErrorDev(['An update to Counter ran an effect']);