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.
const [page, setPage] = React.useState('A');
      const [startLoading, isLoading] = React.useTransition(SUSPENSE_CONFIG);
      transitionToPage = nextPage => startLoading(() => setPage(nextPage));
      return (
        <Fragment>
          <Text text={page} />
          {isLoading ? <Text text="L" /> : null}
        </Fragment>
      );
    }
    
    ReactNoop.render(<App />);
    expect(Scheduler).toFlushAndYield(['A']);
    expect(ReactNoop.getChildren()).toEqual([span('A')]);
    await ReactNoop.act(async () => {
      transitionToPage('B');
      
      
      Scheduler.unstable_advanceTime(200);
      await advanceTimers(200);
      expect(Scheduler).toFlushAndYield(['A', 'L', 'B']);
      expect(ReactNoop.getChildren()).toEqual([span('B')]);
    });