Transitioning to a route (declared first) with the same path name doesn't work (Check the console)

controllers.application.js

import Ember from 'ember';

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

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('foo', { path: '/' }) // Try changing this to a different path than "bar" route. Then, it will work.
  this.route('bar', { path: '/' })
});

export default Router;

routes.bar.js

import Ember from 'ember';

export default Ember.Route.extend({
  beforeModel() {
    // This will throw an exception when I try to do this because "foo" route has the same exact path.
    // BUT, if I change foo's path (e.g. - "/foo"), then it will transition correctly.
    this.transitionTo('foo');
  }
});

templates.application.hbs

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

templates.bar.hbs

This is the bar route!

templates.foo.hbs

This is the foo route!

twiddle.json

{
  "version": "0.14.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "2.18.2",
    "ember-template-compiler": "2.18.2",
    "ember-testing": "2.18.2"
  },
  "addons": {
    "ember-data": "2.18.2"
  }
}