JSON object not supported, only array

[samcat74]

MySQL 8.0 + Symfony 7.3 + Doctrine 3.5

My Entity has a $data column like:

#[ORM\Column(type: JsonDocumentType::NAME)]
private object $data;

running a simple query:

$entities = $this->em->getRepository(MyEntity::class)->findAll();

I'm getting this error

Cannot assign array to property App\Entity\MyEntity::$data of type object

if I remove the object :

private object $data;

it works returning an array which breaks my other code, how to make it to work with objects?