Container returns falsy value as undefined on 2nd or later lookup

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  inspectLookup() {
    return Ember.inspect(this.container.lookup('falsy:false'));
  },
  
  firstLookup: Ember.computed(function() {
    return `1st lookup: ${this.inspectLookup()}`;
  }),
  
  secondLookup: Ember.computed(function() {
    return `2nd lookup: ${this.inspectLookup()}`;
  })
});

application.template.hbs

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

{{this.firstLookup}}<br>
{{this.secondLookup}}<br>

{{outlet}}
<br>
<br>

initializers.application.js

export function initialize(container, application) {
  application.register('falsy:false', false, { instantiate: false });
}

export default {
  name: 'application-init',
  initialize: initialize
};

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": "canary",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "canary"
  }
}