How to use template form when edit object - symfony

Question

I have a form with an embedded form (collectionType). I made a template. It works when I add a new object. But how to use this template when I edit an object ? Below my code an 2 pictures to illustrate my problem
{% extends 'base.html.twig' %}
{% form_theme form _self %}
{% block _paris_rencontres_row %}
<div class="sports" id="renc-xx" style="background-color: rgba(182, 184, 185, 0.200);">
<div
class="row">
{# <ul class="sports" data-prototype="{{ form_widget(form.vars.prototype)|e('html_attr') }}"></ul> #}
<div class="col-md-3">
{{ form_row(form.vars.prototype.playedAt) }}
</div>
<div class="col-md-3">
{{ form_row(form.vars.prototype.sport) }}
</div>
</div>
<div class="row">
<div class="col-md-3">
{{ form_row(form.vars.prototype.player_1) }}
</div>
<div class="col-md-3">
{{ form_row(form.vars.prototype.player_2) }}
</div>
<div class="col-md-2">
{{ form_row(form.vars.prototype.cote) }}
</div>
<div class="col-md-2">
{{ form_row(form.vars.prototype.resultat) }}
</div>
</div>
<hr>
</div>
{% endblock %}
{% block body %}
{# {{ include('paris/_form.html.twig', {form:form, button: 'Ajouter'}) }} #}
<button type='button' id='btn-add' class='add_sport_link btn btn-primary'>Ajouter paris</button>
{{ form_start(form) }}
<div class="paris">
<div class="row">
<div class="col-md-4">
{{ form_row(form.mise) }}
</div>
<div class="col-md-4">
{{ form_row(form.type) }}
</div>
<div class="col-md-4">
{{ form_row(form.win) }}
</div>
</div>
<div class="col-md-4 matchs">
{% if form.rencontres|length > 0 %}
{% for index in 0..form.rencontres|length - 1 %}
{{ dump(index) }}
{{ form_row(form.rencontres[index]) }}
{% endfor %}
{% else %}
{{ form_row(form.rencontres) }}
{% endif %}
</div>
</div>
{{ form_end(form) }}
{% endblock %}
add (form.rencontres|length == 0):
enter image description here
edit (form.rencontres|length > 0):
enter image description here
Regards
PS: Sorry for my english
EDIT: My controller
#NicoHaase I dont think the problem is in the code.
I want just display my form template when I edit an object as when I add an object
`code
/**
* #Route("/paris/add", name="paris_add")
*/
public function add(Request $request)
{
$em = $this->getDoctrine()->getManager();
$paris = new paris();
$form = $this->createForm(ParisType::class, $paris);
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
$em->persist($paris);
$em->flush();
return $this->redirectToRoute('paris');
}
return $this->render("paris/add.html.twig", [
'form' => $form->createView()
]);
}
/**
* #Route("/paris/{id}", name="paris_edit", requirements={"id":"\d+"})
* #param Paris $paris
* #param Request $request
*/
public function edit(Request $request, Paris $paris)
{
$form = $this->createForm(ParisType::class, $paris);
$form->handleRequest($request);
return $this->render("paris/add.html.twig", [
"paris" => $paris,
"form" => $form->createView(),
]);
}
`