How to render ember template for a nested dynamic route?

js`, I have declared some nested routes like this:

Router.map(function() {
  this.route('index', { path: '/' })
  this.route('orders', function() {
    this.route('details', { path: '/:order_id' });
  });
  this.route('not-found', { path: '/*path' });
});

Here the orders.details template is not rendering, the but it is going to the correct route file, Here is the route file:

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

export default Route.extend({
  model(params) {
    const { order_id } = params;
    console.log('params', params);
    return order_id;
  },
  renderTemplate() {
    this.render('orders/details')
  }
});

I also declared the template in a nested manner within orders folder:

This does not render the orders/details template, it always goes to the orders template. Here is my orders/details.hbs template:

<h2>Order </h2>