toggleProperty bug?

components.comp-1.js

import Ember from 'ember';

export default Ember.Component.extend({
  prop1: false,
  hello: 'Text set by comp-1',
  
  actions: {
    customAction1() {
      this.toggleProperty('prop1');
    }
  }
});

components.comp-2.js

import Ember from 'ember';

export default Ember.Component.extend({
  data: [
    {name: 'Text set by comp-2', bool: false},
    {name: 'Text set by comp-2', bool: true}
  ]
});

templates.application.hbs

{{comp-2}}

templates.components.comp-1.hbs

<button {{action 'customAction1'}}>{{hello}}</button>{{#if prop1}}true{{else}}false{{/if}}

templates.components.comp-2.hbs

{{#each data as |d|}}
  {{comp-1 hello=d.name prop1=d.bool}}
{{/each}}

twiddle.json

{
  "version": "0.4.9",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.0.1/ember.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.0.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.0.0/ember-template-compiler.js"
  }
}