_getQPMeta(handlerInfo) {
    let routeName = handlerInfo.name;
    let isWithinEngine = this._engineInfoByRoute[routeName];
    let hasBeenLoaded = this._seenHandlers[routeName];
    if (isWithinEngine && !hasBeenLoaded) {
      return undefined;
    }

    return this._super(...arguments);
  }
When going to an Engine route, we check for QP meta in the BucketCache
instead of checking the Route (which may not exist yet). We populate
the BucketCache after loading the Route the first time.

@override