Promises, wait what?

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  
  firstLevel() {
    return new Ember.RSVP.Promise((resolve, reject) => {
      Ember.run(null, reject);
    }).finally(() => {
    	// finally handler
    });
  },
  
  secondLevel() {
    // Both of these mess up thirdLevel execution to success
    
    /*return this.firstLevel().then(() => {
      // success
    }, () => {
      // error
    });*/
    
    return this.firstLevel().catch(() => {
      // error
    });
  },
  
  actions: {
   	thirdLevel() {
      this.secondLevel().then(() => {
        alert('it should not be called');
      });
    }
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

<button {{action 'thirdLevel'}}>Click me</button>

twiddle.json

{
  "version": "0.4.17",
  "EmberENV": {
    "FEATURES": {}
  },
  "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"
  }
}