Repro case with a master build: https://codesandbox.io/s/stoic-mcnulty-dhygf?file=/src/App.js:668-703

Expected: we see content after a second.
Actual: fallback never resolves.

This happens in a sequence of:

1. Normal update
   - which suspends
2. Idle update
   - which also suspends
3. An unrelated normal update immediately followed by a ping (so they're batched)
   - here, we decide to stay on fallback, but should've shown the content

If you remove `_setVersion(v => v + 1);` on line 44 then the issue goes away.
}
    }
    ReactNoop.render(<Foo text="" />);
    ReactNoop.expire(1000);
    jest.advanceTimersByTime(1000);
    ReactNoop.render(<Foo text="go" />);
    ReactNoop.expire(1000);
    jest.advanceTimersByTime(1000);
    ReactNoop.render(<Foo text="good" />);
    ReactNoop.expire(1000);
    jest.advanceTimersByTime(1000);
    ReactNoop.render(<Foo text="goodbye" />);
    Scheduler.unstable_advanceTime(10000);
    jest.advanceTimersByTime(10000);
    expect(Scheduler).toFlushExpired([
      'Suspend! [goodbye]',
      'Loading...',
      'Commit: goodbye',
    ]);
    expect(ReactNoop.getChildren()).toEqual([span('Loading...')]);
    Scheduler.unstable_advanceTime(20000);
    await advanceTimers(20000);
    expect(Scheduler).toHaveYielded(['Promise resolved [goodbye]']);
    expect(ReactNoop.getChildren()).toEqual([span('Loading...')]);
    expect(Scheduler).toFlushAndYield(['goodbye']);
    expect(ReactNoop.getChildren()).toEqual([span('goodbye')]);
  });
  it('a suspended update that expires', async () => {
    
    function ExpensiveText({text}) {