ember-data route's model hook only fetches model properly with forced reload

I have an application that requires two models in one of the routes.

Here I use RSVP.hash to bundle the two promises into one and return them for the setupController. Somehow one of the records is not retrieved properly and does not contain any data (the server is not requested either). So the state of the record after the promise hash was resolved is still root.empty.

I currently use a workaround that calls a record.reload() from the server, which triggers a refetch, like so:

model: function(param){
  return Ember.RSVP.hash({
        activities: this.store.find('activity', {'component_id': param.component_id}),
        component: this.store.find('component', param.component_id)
    }).then(function(models){
        //move component manually from DS.RootState.empty to loaded.saved
        models.component.transitionTo('loaded.saved');

        //force reload returns a promise.
        return models.component.reload().then(function(component){
            return {component: component, activities: models.activities};
        });
    });
}

The Stack:

DEBUG: -------------------------------
DEBUG: Ember             : 1.11.1
DEBUG: Ember Data        : 1.0.0-beta.15
DEBUG: jQuery            : 1.11.2
DEBUG: Ember Simple Auth : 0.7.1
DEBUG: -------------------------------

Since this workaround in my opinion does not look good to me, i feel I must have forgotten something, so my questions are:

• Is there a better solution?
• What is the root cause of this?

If you require more information, I'm more than happy to provide it.