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(Scheduler).toFlushAndYieldThrough([
            'A 0',
            'B 0',
            'Sync effect',
          ]);
          expect(ReactNoop.getChildren()).toEqual([span('A 0'), span('B 0')]);
        });
        expect(Scheduler).toHaveYielded(['Mount A [0]', 'Mount B [0]']);
        act(() => {
          ReactNoop.render(
            <>
              <Counter label="A" count={1} />
              <Counter label="B" count={1} />
            </>,
            () => Scheduler.unstable_yieldValue('Sync effect'),
          );
          expect(Scheduler).toFlushAndYieldThrough([
            'A 1',
            'B 1',
            'Sync effect',
          ]);
          expect(ReactNoop.getChildren()).toEqual([span('A 1'), span('B 1')]);
        });
        expect(Scheduler).toHaveYielded([
          'Unmount A [0]',
          'Unmount B [0]',
          'Mount A [1]',
          'Mount B [1]',
        ]);
        act(() => {