Symfony 5: controller requires that you provide a value for an argument

I have recently bought a new computer. Both old and new have xampp over Windows 10. After I have copied all my apache, mysql and php configuration files to the new one and once checked everything can run. I find an error on one of my symfony sites homepage using exactly the same files I was using previously.

Controller “AppControllerFrontendController::index()” requires that
you provide a value for the “$locale” argument. Either the argument is
nullable and no null value has been provided, no default value has
been provided or because there is a non optional argument after this
one.

In order to check for the possible error I have created a new FrontendController class with the minimal code I needed in order to reproduce my error.

Here is the code that does not generate the error:

<?php

namespace AppController;

use SymfonyBundleFrameworkBundleControllerAbstractController;
use SymfonyComponentHttpFoundationRequest;
use SymfonyComponentRoutingAnnotationRoute;

class FrontendController extends AbstractController 
{

    /** 
     * @Route("/", name="index")
     */

    public function index(
      Request $request,
      string $locale = 'es'
    ) {
      dd($locale);
    }
  }

Here is the code that DOES generate the error. The only difference is that I add WhiteOctober/BreadcrumbsBundle that works like a charm in my installation on the previous computer.

<?php

namespace AppController;

use SymfonyBundleFrameworkBundleControllerAbstractController;
use SymfonyComponentHttpFoundationRequest;
use SymfonyComponentRoutingAnnotationRoute;
use WhiteOctoberBreadcrumbsBundleModelBreadcrumbs;

class FrontendController extends AbstractController 
{

    /** 
     * @Route("/", name="index")
     */

    public function index(
      Request $request,
      string $locale = 'es',
      Breadcrumbs $breadcrumbs
    ) {
      dd($locale);
    }
  }

Again, when I remove $locale from the parameters list, things also work:

<?php

namespace AppController;

use SymfonyBundleFrameworkBundleControllerAbstractController;
use SymfonyComponentHttpFoundationRequest;
use SymfonyComponentRoutingAnnotationRoute;
use WhiteOctoberBreadcrumbsBundleModelBreadcrumbs;

class FrontendController extends AbstractController 
{

    /** 
     * @Route("/", name="index")
     */

    public function index(
      Request $request,
      Breadcrumbs $breadcrumbs
    ) {
      dd("Without locale");
    }
  }