Production build doesn't include tags from head.hbs

[egemon]

enviroment.js

/* jshint node: true */
module.exports = function(environment) {
  var ENV = {
    modulePrefix: 'blabla',
    environment: environment,
    rootURL: '/',
    locationType: 'auto',
    EmberENV: {
      FEATURES: {
      },
      EXTEND_PROTOTYPES: {
        Date: false
      }
    },
    APP: {
    }
  };

  if (environment === 'test') {
    ENV.locationType = 'none';
    ENV.APP.LOG_ACTIVE_GENERATION = false;
    ENV.APP.LOG_VIEW_LOOKUPS = false;
    ENV.APP.rootElement = '#ember-test';
  }

  return ENV;
};

application.js

import Ember from 'ember';

export default Ember.Route.extend({
  headData: Ember.inject.service(),
  afterModel() {
    this.set('headData.rootURL', this.router.rootURL);
  }
});

head.hbs

<link rel="stylesheet" href="{{model.rootURL}}assets/vendor.css">
<link rel="stylesheet" href="{{model.rootURL}}assets/my-project.css">
<link rel="stylesheet" href="https://some/static/path/style.css" media="screen" title="no title">

Everything works fine during ember server, and nothing is injected when running ember build -prod. Is it the expected behavior?