Symfony 6 - Something wrong with getter - php

Question

Hey I'm starting with php and symfony and something goes wrong when I'm trying to use Support's getter. Here is what I'm getting when I use dd($ticket) in showTicket function
empty (php): supportChats
Here, supportChats is empty.
But if I use dump(ticket) inside the view associated, here is what I have
isNotEmpty (twig): supportChats
Here, supportchats is NOT empty.
So, my question is: how it is possible ? i really need explanations please
Here is my showTicket function
#[Security("is_granted('ROLE_USER') and user === currentUser")]
#[Route('/user/profil/{username}/ticket/{ticket_id}', name: 'user.profile.ticket', methods: ['GET|POST'])]
#[ParamConverter('ticket', class: Support::class, options: ['id' => 'ticket_id'])]
public function showTicket(Request $request, User $currentUser, Support $ticket): Response
{
return $this->render('user/index.html.twig', [
'ticket' => $ticket,
'panelTicket' => 'show', // twig
'panel' => 'tickets', // js
'formUserPassword' => $this->createForm(UserPasswordType::class)->createView(),
'formTickets' => $this->createForm(TicketType::class)->createView()
]);
}
And finally the view associated
<div class="d-flex border border-danger border-start-0 border-end-0 text-light mb-5 w-75 mx-auto">
<div style="min-width: 25%" class="d-flex flex-column border-info text-center w-25">
<div class="border-bottom border-danger">{{ ticket.user.firstname }}</div>
<div>Posté le <br> {{ ticket.createdAt|format_datetime(locale='fr') }}</div>
</div>
<div class="d-flex border-start border-danger text-break p-2 w-100">
<div class="flex-grow-1">
{{ ticket.message }}
</div>
<div class="d-flex flex-column justify-content-center">
{% if ticket.supportChats|length == 0 %}
<a class="btn btn-danger align-self-center w-100" href="#">Modifier</a>
<a data-action="{{ path('user.profile', {username: app.user.username}) }}" data-id="{{ ticket.id }}" class="submit-update submit-update-ticket btn btn-danger align-self-center w-100 mt-1" name="delete-ticket" title="Supprimer le Ticket">Supprimer</a>
{% endif %}
{{dump(ticket)}}
Retour
</div>
</div>
</div>