hasBlock not available in partial for Ember 2.9.0-beta

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{#my-component}}
<p>Success! You are seeing the block template</p>
{{/my-component}}

templates.components.my-component.hbs

{{partial "my-partial"}}

templates.my-partial.hbs

yield:[{{yield}}]

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": "beta",
    "ember-data": "release",
    "ember-template-compiler": "beta"
  },
  "addons": {}
}