MenuTestServiceProvider.php

<?php

declare (strict_types=1);
namespace Drupal\menu_test;

use Drupal\Core\DependencyInjection\ContainerBuilder;
use Drupal\Core\DependencyInjection\ServiceModifierInterface;
use Symfony\Component\DependencyInjection\Reference;

/**
 * Decorate core's default path-based breadcrumb builder when it is available.
 */
class MenuTestServiceProvider implements ServiceModifierInterface {
    
    /**
     * {@inheritdoc}
     */
    public function alter(ContainerBuilder $container) : void {
        if ($container->has('system.breadcrumb.default')) {
            $container->register('menu_test.breadcrumb.default', SkippablePathBasedBreadcrumbBuilder::class)
                ->setDecoratedService('system.breadcrumb.default')
                ->addArgument(new Reference('menu_test.breadcrumb.default.inner'))
                ->addArgument(new Reference('request_stack'));
        }
    }

}