Query params issue

controllers.application.js

import Ember from 'ember';
import {
  inject as service
} from '@ember/service';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  queryParams: ['appQP'],
    router: service(),
  
  actions: {
    changeQPandTransition: function() {
      this.set('appQP', 'changed')
      var queryParams = {
        'hello': true
      }
      
     	this.router.transitionTo('my-route', {
      queryParams: queryParams
    })
    }
  }
});

controllers.my-route.js

import Ember from 'ember';

export default Ember.Controller.extend({
  queryParams: ['hello']
});

router.js

import EmberRouter from '@ember/routing/router';
import config from './config/environment';

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

Router.map(function() {
  this.route('my-route');
});

export default Router;

routes.my-route.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<div {{action 'changeQPandTransition'}}>Click me to see failure</div>
<br><br>
{{#link-to 'my-route'}}Link to my-route{{/link-to}}
<br><br>
{{outlet}}  
<br>
<br>

templates.my-route.hbs

Here on my route!

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"
  }
}