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.
props,
          renderExpirationTime,
        );
        return child;
      }
      break;
    }
  }
  let hint = '';
  if (__DEV__) {
    if (
      Component !== null &&
      typeof Component === 'object' &&
      Component.$$typeof === REACT_LAZY_TYPE
    ) {
      hint = ' Did you wrap a component in React.lazy() more than once?';
    }
  }
  
  
  
  invariant(
    false,
    'Element type is invalid. Received a promise that resolves to: %s. ' +
      'Lazy element type must resolve to a class or function.%s',
    Component,
    hint,
  );
}
function mountIncompleteClassComponent(