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.
return (
        <>
          <A />
          <B />
        </>
      );
    }
    const root = ReactNoop.createRoot();
    await ReactNoop.act(async () => {
      await resolveText('A');
      await resolveText('B');
      root.render(<App />);
    });
    expect(Scheduler).toHaveYielded(['A', 'B']);
    expect(root).toMatchRenderedOutput(
      <>
        <span prop="A" />
        <span prop="B" />
      </>,
    );
    await ReactNoop.act(async () => {