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.
constructor(props) {
          super(props);
          const text = props.text;
          Scheduler.unstable_yieldValue('constructor');
          try {
            readText(text);
            this.state = {text};
          } catch (promise) {
            if (typeof promise.then === 'function') {
              Scheduler.unstable_yieldValue(`Suspend! [${text}]`);
            } else {
              Scheduler.unstable_yieldValue(`Error! [${text}]`);
            }
            throw promise;
          }
        }
        componentDidMount() {