ember replaceWith does not changes the url

How to perform some replaceWith to the same route but with a different parameter?

The route declaration is:

this.route('sampleRoute', { path: '/:param_name' });

This 'sampleRoute' route reproduces the problem: the URL does not changes after a replaceWith inside it.

let globalFlag = null;

export default Route.extend({
  afterModel() {

    console.log("welcome");

    if(globalFlag){
      console.log(this.router.location.getURL());
      console.log(this.paramsFor(this.routeName).param_name);
    } else {
      globalFlag = true;
      this.replaceWith(this.routeName, 'progValue');
    }
  }
});

Tried with beforeModel, model, afterModel. How to have the URL properly set before running some code?

Testing this route with http://localhost/sampleRoute/browserValue produces:

Expected output: 
    welcome
    welcome
    /sampleRoute/progValue
    progValue

Actual output:
    welcome
    welcome
    /sampleRoute/browserValue
    progValue