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.
setOuterText(text);
        setInnerText(text);
      }
      
      await resolveText('Inner text: A');
      await ReactNoop.act(async () => {
        root.render(<Parent step={0} />);
      });
      expect(Scheduler).toHaveYielded([
        'Outer text: A',
        'Outer step: 0',
        'Inner text: A',
        'Inner step: 0',
        'Commit Child',
      ]);
      expect(root).toMatchRenderedOutput(
        <>
          <span prop="Outer text: A" />