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.
React.useLayoutEffect(() => {
        Scheduler.unstable_yieldValue(`Layout Effect [${props.text}]`);
        return () => {
          Scheduler.unstable_yieldValue(
            `Destroy Layout Effect [${props.text}]`,
          );
        };
      }, [props.text]);
      React.useEffect(() => {
        Scheduler.unstable_yieldValue(`Effect [${props.text}]`);
        return () => {
          Scheduler.unstable_yieldValue(`Destroy Effect [${props.text}]`);
        };
      }, [props.text]);
      const text = props.text;
      try {
        readText(text);
        Scheduler.unstable_yieldValue(text);
        return <span prop={text} />;
      } catch (promise) {
        if (typeof promise.then === 'function') {
          Scheduler.unstable_yieldValue(`Suspend! [${text}]`);
        } else {
          Scheduler.unstable_yieldValue(`Error! [${text}]`);
        }
        throw promise;
      }
    }
    function App({text}) {