[PHP/Symfony] BUG Generate string insteaf of object

I defined a User with an email

definitions:
  User:
    type: object
    properties:
      email:
        $ref: '#/definitions/Email'
  Email:
    type: string
    format: email

the library generate a class Email

class SWEmail 
{
    public function __construct(array $data = null) { }
}

And a User (where @Type is \Email and not string)

class SWUser 
{
    /**
     * @var App\Model\SW\Email|null
     * @SerializedName("email")
     * @Assert\Type("App\Model\SW\SWEmail")
     * @Type("App\Model\SW\SWEmail")
     */
    protected $email;
}

If I want the PHP object :

class User
{
    private $email;
    public function setEmail(string $email) {
        $this->email = $email;
    }
}
$user = new User();
$user->setEmail('foo@bar.com');
App\Model\User {
      email: "foo@bar.com"
}

After using jms Serializer, The error is :
must be an object, string given

Because swagger codegen generate
@Type("App\Model\SW\SWEmail") insteaf of @Type("string")

In java there is no Email Model generated, and the User Model has an email type String

public class SWUser {
  @SerializedName("email")
  private String email = null;
}

Is there a way to fix it ?

Swagger-codegen version
2.4.12

Command line used for generation
java -jar swagger-codegen-cli.jar generate -i C:\swagger.yaml -l php-symfony -o C:\generationDirectory

Steps to reproduce
Symfony 5
PHP 7.4

Reproduce the php-symfony generation command with the supplied Swagger definition under Symfony 5 and PHP 7.4, then compare the generated SWUser annotations with the Java output shown. Trace the generator entry point and templates responsible for a string schema referenced through $ref. Done means the PHP property is generated as a string and JMS Serializer no longer expects an object.