Alias bug

application.controller.js

import Ember from 'ember';

let Model = Ember.Object.extend({
  foobar: Ember.computed.alias("Foo.bar")
});

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  update: function () {
    let model = Model.create({Foo: {bar: "bar"}});
    this.set("model",model);
    setTimeout(() => {
    	this.set("model.Foo", {bar:"BOO"});
    }, 1000);
    setTimeout(() => {
    	this.set("model", null);
    }, 2000);
  }.on("init")
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{#if model}}
{{model.Foo.bar}}
{{model.foobar}}
{{outlet}}
{{/if}}
<br>
<br>

twiddle.json

{
  "version": "0.5.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}