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.
'Suspend! [A2]',
        'Loading...',
        'Suspend! [B2]',
        'Loading...',
      ]);
      expect(root).toMatchRenderedOutput(
        <>
          <span prop="A1" />
          <span prop="B" />
        </>,
      );
      
      Scheduler.unstable_advanceTime(20000);
      await advanceTimers(20000);
      expect(root).toMatchRenderedOutput(
        <>
          <span hidden={true} prop="A1" />
          <span prop="Loading..." />
          <span hidden={true} prop="B" />
          <span prop="Loading..." />
        </>,
      );
    });
  });
  
  
  it('does not get stuck in pending state with render phase updates', async () => {
    let setTextWithShortTransition;
    let setTextWithLongTransition;
    function App() {