Provider with existing service id not found.

[subiabre]

Providers are not being correctly registered using the Symfony Bundle version of the AutoMapper under release 9.2 in Symfony 6.

Implementing the following mapper:

# src/Mapping/UserMapProvider.php
namespace App\Mapping;

use AutoMapper\Provider\ProviderInterface;

class UserMapProvider implements ProviderInterface
{
    public function provide(string $targetType, mixed $source, array $context): object|array|null
    {
        var_dump($targetType, $source, $context);
        exit;
    }
}

# src/Entity/User.php
namespace App\Entity;

use App\Mapping\UserMapProvider;
use AutoMapper\Attribute\MapProvider;

#[MapProvider(provider: UserMapProvider::class)]
class User

Throws the exception Provider with id "App\\Mapping\\UserMapProvider" not found.. Manually supplying the provider to Automapper::create() works successfully, but when using the AutoMapperInterface from Symfony's dependency injection fails even when registering the map provider as a public service.

The documentation states that "When using the Symfony Bundle version of the AutoMapper, the provider will be the service id, which may be different from the class name" but the service id is correct:

$ bin/console debug:container App\\Mapping\\UserMapProvider

Information for Service "App\Mapping\UserMapProvider"
=====================================================

 ---------------- ----------------------------- 
  Option           Value                        
 ---------------- ----------------------------- 
  Service ID       App\Mapping\UserMapProvider  
  Class            App\Mapping\UserMapProvider