glimmer-issue

controllers.index.js

import Ember from 'ember';

export default Ember.Controller.extend({
  myService: Ember.inject.service(),

  init() {
    this._super(...arguments);
    this.set('controllerArray', ['xxx']);
  },

  serviceArrayCP: Ember.computed('myService.serviceArray.[]', function() {
    return this.get('myService.serviceArray');
  }),
});

helpers.time-helper.js

import Ember from 'ember';

export default Ember.Helper.extend({
  compute(value, hash) {
    this.clearTimer();

    this.timer = Ember.run.later(this, this.recompute, 1000);

    return new Date();
  },

  clearTimer() {
    Ember.run.cancel(this.timer);
  },

  destroy(...args) {
    this._super(...args);

    this.clearTimer();
  }
});

routes.index.js

import Ember from 'ember';

export default Ember.Route.extend({
  setupController(controller) {
    this._super(...arguments);
    controller.get('myService')._runOnce();
  }
});

services.my-service.js

import Ember from 'ember';

export default Ember.Service.extend({
  init() {
    this._super(...arguments);
    this.set('serviceArray', Ember.A());
  },

  _runOnce() {
    // this._pushObj();
    Ember.run.once(this, this._pushObj);
  },

  _pushObj() {
    console.log('_pushObj');
    this.get('serviceArray').pushObject('foo');
  },
});

templates.index.hbs

{{time-helper}}

<div class="abc">
  {{#each controllerArray as |aaa|}}
    {{aaa}}
  {{/each}}
</div>

{{log serviceArrayCP}}

twiddle.json

{
  "version": "0.10.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0-beta.3",
    "ember-data": "2.8.0",
    "ember-template-compiler": "2.9.0-beta.3",
    "ember-testing": "2.9.0-beta.3"
  },
  "addons": {}
}