_qpDelegate

controllers.application.js

import Ember from 'ember';

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

controllers.dashboard.js

import Ember from 'ember';

export default Ember.Controller.extend({
  shared: Ember.inject.service('shared-state'),
  queryParams:[
    {"shared.isChecked": "checked"}
  ]
});

controllers.home.js

import Ember from 'ember';

export default Ember.Controller.extend({
  shared: Ember.inject.service('shared-state'),
  queryParams:[
    {"shared.isChecked": "checked"}
  ],
});

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route("home", { path: '/' });
  this.route("dashboard", { path: '/dashboard' });

});

export default Router;

routes.dashboard.js

import Ember from 'ember';

export default Ember.Route.extend({
  shared: Ember.inject.service('shared-state')
});

routes.home.js

import Ember from 'ember';

export default Ember.Route.extend({
  shared: Ember.inject.service('shared-state')
});

services.shared-state.js

import Ember from 'ember';

export default Ember.Service.extend({
  isChecked: true,
  forcePropertyChange(){
    //toggle the property to force a property change
    this.toggleProperty('isChecked');
    //this.toggleProperty('isChecked');
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>

<br>
<br>
{{outlet}}
<br>
<br>

templates.dashboard.hbs

<h1>Dashboard</h1>

Steps to reproduce.
<ol>
 <li>
   <label>
    click the checkbox {{input type="checkbox" checked=(mut shared.isChecked) }}  before transistioning to dashboard to force error
    
  </label>
 </li>
 <li>
   Transition to {{link-to 'home' 'home'}} after editing a property in the shared state. 
 </li>
</ol>

templates.home.hbs

<h1>Home</h1>

Steps to reproduce.
<ol>
 <li>
   <label>
      click the checkbox {{input type="checkbox" checked=(mut shared.isChecked) }}  before transistioning to dashboard to force error
  </label>
 </li>
 <li>
   Transition to {{link-to 'dashboard' 'dashboard'}} after editing a property in the shared state. 
 </li>
</ol>

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": "2.1.2",
    "ember-data": "2.0.1",
    "ember-template-compiler": "2.1.2",
    "ember-testing": "2.1.2"
  },
  "addons": {}
}