Ember-simple-auth cant get currentUser after reload

I have a simple Ember app (repo) with authentication using ember-simple-auth (i followed this article http://ift.tt/2sB6w2m). After logging in I have access to currentUser in my routes, controllers and templates. However, if I navigate to any route besides my ApplicationRoute and reload the browser, I can no longer access currentUser in that route, but it's available in the template. If I navigate back to application route and navigate to different one again, then I can access the currentUser. How can I fix this, i.e. I want to be able to access currentUser in any route even after reload?

ApplicationRoute:

import Ember from 'ember';
import ApplicationRouteMixin from 'ember-simple-auth/mixins/application-route-mixin';

export default Ember.Route.extend(ApplicationRouteMixin, {
  sessionAccount: Ember.inject.service(),
  beforeModel() {
    this.get('sessionAccount').loadCurrentUser();
  }
});

SessionAccount service:

import Ember from 'ember';

const { inject: { service }, RSVP } = Ember;

export default Ember.Service.extend({
  session: service('session'),
  store: service(),


  loadCurrentUser() {
    if (this.get('session.isAuthenticated')) {
      this.get('store')
      .queryRecord('user', { me: true })
      .then((user) => {
        this.set('currentUser', user);
      });
    } else {
      return RSVP.resolve();
    }
  }
});

Bookings route - the 'other' route:

import Ember from 'ember';
import AuthenticatedRouteMixin from 'ember-simple-auth/mixins/authenticated-route-mixin';

export default Ember.Route.extend(AuthenticatedRouteMixin, {
  sessionAccount: Ember.inject.service(),

  model() {
    const currentUser = this.get('sessionAccount.currentUser');

    return this.get('store').query('booking', {
      filter: {
        'user_id': currentUser.id
      },
      include: 'rental,rental.rental-ratings'
    });
  }
});