collection empty in symfony when collecting many to many datas - symfony

Question

I have two entities Template and Zone in Symfony connected by a many to many relationship.
I'm trying to get datas from one of theses so i'm using the following command
$templates = $this->getDoctrine()
->getRepository(Template::class)
->findAll();
I succeed to get my templates datas but the champ "zones" display an empty collection.
Have you got an idea about why I don't get the zones attached to the template.
Here are my code :
<?php
namespace App\Entity;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity(repositoryClass="App\Repository\TemplateRepository")
*/
class Template
{
/**
* #ORM\Id()
* #ORM\GeneratedValue()
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\Column(type="string", length=255)
*/
private $name;
/**
* Many Users have Many Groups.
* #ORM\ManyToMany(targetEntity="Zone", inversedBy="templates")
* #ORM\JoinTable(name="templates_zones")
*/
private $zones;
/**
* #ORM\Column(type="integer", nullable=true)
*/
private $zonesNumber;
/**
* #ORM\Column(type="string", length=1)
*/
private $format;
/**
* #ORM\Column(type="integer")
*/
private $level;
/**
* #ORM\Column(type="string", length=255, nullable=true)
*/
private $background;
/**
* Template constructor.
* #param $zones
*/
public function __construct()
{
$this->zones = new \Doctrine\Common\Collections\ArrayCollection();
}
public function getId(): ?int
{
return $this->id;
}
public function getName(): ?string
{
return $this->name;
}
public function setName(string $name): self
{
$this->name = $name;
return $this;
}
public function getZonesNumber(): ?int
{
return $this->zonesNumber;
}
public function setZonesNumber(?int $zonesNumber): self
{
$this->zonesNumber = $zonesNumber;
return $this;
}
public function getFormat(): ?string
{
return $this->format;
}
public function setFormat(string $format): self
{
$this->format = $format;
return $this;
}
public function getLevel(): ?int
{
return $this->level;
}
public function setLevel(int $level): self
{
$this->level = $level;
return $this;
}
public function getBackground(): ?string
{
return $this->background;
}
public function setBackground(?string $background): self
{
$this->background = $background;
return $this;
}
/**
* #return Collection|Zone[]
*/
public function getZones(): Collection
{
return $this->zones;
}
public function addZone(Zone $zone): self
{
if (!$this->zones->contains($zone)) {
$this->zones[] = $zone;
}
return $this;
}
public function removeZone(Zone $zone): self
{
if ($this->zones->contains($zone)) {
$this->zones->removeElement($zone);
}
return $this;
}
}
And the zone Entity
<?php
namespace App\Entity;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity(repositoryClass="App\Repository\ZonesRepository")
*/
class Zone
{
/**
* #ORM\Id()
* #ORM\GeneratedValue()
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\Column(type="string", length=255)
*/
private $name;
/**
* Many Groups have Many Users.
* #ORM\ManyToMany(targetEntity="Template", mappedBy="zones")
*/
private $templates;
/**
* Zone constructor.
* #param $templates
*/
public function __construct()
{
$this->templates = new \Doctrine\Common\Collections\ArrayCollection();
}
public function getId(): ?int
{
return $this->id;
}
public function getName(): ?string
{
return $this->name;
}
public function setName(string $name): self
{
$this->name = $name;
return $this;
}
/**
* #return Collection|Template[]
*/
public function getTemplates(): Collection
{
return $this->templates;
}
public function addTemplate(Template $template): self
{
if (!$this->templates->contains($template)) {
$this->templates[] = $template;
$template->addZone($this);
}
return $this;
}
public function removeTemplate(Template $template): self
{
if ($this->templates->contains($template)) {
$this->templates->removeElement($template);
$template->removeZone($this);
}
return $this;
}
}