ember-power-select bug

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'rhyek',
  valueA: null,
  optionsA: ['a', 'b', 'c']
});

templates.application.hbs

{{#power-select
	selected=valueA
  options=optionsA
  onchange=(action (mut valueA))
  as |option|
}}
  {{options}}
{{/power-select}}

twiddle.json

{
  "version": "0.10.4",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.6.2",
    "ember-data": "2.7.0",
    "ember-template-compiler": "2.6.2"
  },
  "addons": {
    "ember-power-select": "1.0.0-beta.12"
  }
}