queryParams Bug

controllers.application\.js

import Controller from '@ember/controller';
import { action } from '@ember/object';
import { inject as service } from '@ember/service';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
	@service router;
  
  @action async transition(route) {
    try {
      await this.router.transitionTo(route, Math.random(), {
        queryParams: { mode: `${Math.random()}` }
      });
    } catch (e) {
      alert(e);
    }
  }
}

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-a', { path: 'a/:id' });
  this.route('my-route-b', { path: 'b/:id' });
});

export default Router;

routes.my-route-a\.js

import Route from '@ember/routing/route';

export default class RouteA extends Route {
  queryParams = {
  	mode: { refreshModel: true }
	};
                            
  async model() {    	
     return {};
  }
}

routes.my-route-b\.js

import Route from '@ember/routing/route';

export default class RouteA extends Route {
  queryParams = {
  	mode: { refreshModel: false }
	};
                            
  async model() {
     return {};
  }
}

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<button {{on "click" (fn this.transition "my-route-a")}}>refreshModel=true</button>
<button {{on "click" (fn this.transition "my-route-b")}}>refreshModel=false</button>

<br>

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}