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.
]);
    expect(Scheduler).toFlushAndYield(['A', 'B']);
    expect(ReactNoop.getChildren()).toEqual([span('A'), span('B')]);
  });
  it('can resume rendering earlier than a timeout', async () => {
    ReactNoop.render(<Suspense fallback={<Text text="Loading..." />} />);
    expect(Scheduler).toFlushAndYield([]);
    ReactNoop.render(
      <Suspense fallback={<Text text="Loading..." />}>
        <AsyncText text="Async" ms={100} />
      </Suspense>,
    );
    expect(Scheduler).toFlushAndYield(['Suspend! [Async]', 'Loading...']);
    expect(ReactNoop.getChildren()).toEqual([]);
    
    
    await advanceTimers(99);
    
    expect(Scheduler).toFlushWithoutYielding();
    expect(ReactNoop.getChildren()).toEqual([]);
    
    await advanceTimers(1);
    
    expect(Scheduler).toHaveYielded(['Promise resolved [Async]']);
    expect(Scheduler).toFlushAndYield(['Async']);
    expect(ReactNoop.getChildren()).toEqual([span('Async')]);
  });
  
  it('starts working on an update even if its priority falls between two suspended levels', async () => {
    function App(props) {