link-to nested routes bug

application.template.hbs

<h1><code>\{{link-to}}</code> nested routes bug</h1>
<p>When using nested routes and the same segment names (eg <code>:slug</code>) in all nested paths, the \{{link-to}} helper doesn't build the right URL.</p>

<h2>Bug Demo:</h2>
<h3>Router:</h3>
<pre>Router.map(function() {
  this.route('page', { path: '/page/:slug' }, function() {
    this.route('child', { path: '/:slug' });
  });
});</pre>

<h3>Template:</h3>
<p>{{link-to "Link to page.child route" "page.child" "about" "team"}}</p>
<pre>\{{link-to "Link to page.child route" "page.child" "about" "team"}}</pre>

<ul>
<li>Expected result:<br><code>https://ember-twiddle.com/page/about/team</code></li>
<li>End result:<br><code>https://ember-twiddle.com/page/<strong>team/team</strong></code></li>
</ul>

<hr>

<h2>Different segment names work though:</h2>
<h3>Router:</h3>
<pre>Router.map(function() {
  this.route('newPage', { path: '/new-page/:page_slug' }, function() {
    this.route('child', { path: '/:child_slug' });
  });
});</pre>

<h3>Template:</h3>
<p>{{link-to "Link to newPage.child route" "newPage.child" "about" "team"}}</p>
<pre>\{{link-to "Link to newPage.child route" "newPage.child" "about" "team"}}</pre>

<ul>
<li>Expected result:<br><code>https://ember-twiddle.com/new-page/about/team</code></li>
<li>End result:<br><code>https://ember-twiddle.com/new-page/about/team</code></li>
</ul>

router.js

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

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

Router.map(function() {
  // this doesn't work
  this.route('page', { path: '/page/:slug' }, function() {
    this.route('child', { path: '/:slug' });
  });
  
  // this does
  this.route('newPage', { path: '/new-page/:page_slug' }, function() {
    this.route('child', { path: '/:child_slug' });
  });
});

export default Router;

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

twiddle.json

{
  "version": "0.6.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.3.1",
    "ember-template-compiler": "2.3.1"
  }
}