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 (
        <Suspense fallback="Loading...">
          <Text text="Sibling" />
          {shouldSuspend ? (
            <AsyncText ms={10000} text={'Step ' + step} />
          ) : (
            <Text text={'Step ' + step} />
          )}
        </Suspense>
      );
    }
    function interrupt() {
      
      
      ReactNoop.flushSync(() => {
        ReactNoop.renderToRootWithID(null, 'other-root');
      });
    }
    
    
    await ReactNoop.act(async () => {
      root.render(<App step={0} shouldSuspend={false} />);
    });
    await advanceTimers(1000);
    expect(Scheduler).toHaveYielded(['Sibling', 'Step 0']);
    
    await ReactNoop.act(async () => {
      root.render(<App step={1} shouldSuspend={true} />);