Ember sort with computed property - broken

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
    
  init() {
    this._super(...arguments);
    this.items = Ember.A([
      Ember.Object.create({name: 'a'}),
      Ember.Object.create({name: 'b'}),
      Ember.Object.create({name: 'c'})
    ]);
  },
  
  sortProperties: ['name:desc'],
  
  //itemsSorted: Ember.computed.sort('[email protected]', 'sortProperties'),
  itemsSorted: Ember.computed('[email protected]', function() {
  	return this.get('items').sort(function() {});
	})
  
});

templates.application.hbs

{{#each itemsSorted as |item|}}
   {{item.name}}<br/>
{{/each}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}