ember-sortable focus issue

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  items: [
    {
      name: 'Miguel'
    },
    {
      name: 'Link'
    },
    {
      name: 'Zelda'
    },
    {
      name: 'Ganon'
    },
    {
      name: 'Majora'
    },
    {
      name: 'Zant'
    }
  ],
  
  actions: {
    reorderItems(itemModels) {
      this.set('items', itemModels);
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<input type=text>
<br>
{{#sortable-group tagName="ul" onChange="reorderItems" as |group|}}
  {{#each items as |item|}}
    {{#sortable-item tagName="li" model=item group=group}}
      {{item.name}}
    {{/sortable-item}}
  {{/each}}
{{/sortable-group}}
<br>
<br>

twiddle.json

{
  "version": "0.13.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3",
    "ember-sortable": "1.11.0"
  }
}