Declare nativeType of parent property explicitly as workaround for bug in symfony TypeInfo

Symfony/type-info returns an invalid property type for the parent property based on the @phpstan-var static phpdoc in the parent. It returns some App\Entity\Base\AttachmentType which does not exists.
Symfony issue: https://github.com/symfony/symfony/issues/62922

src/Entity/ProjectSystem/Project.php

@@ -49,6 +49,8 @@ use Doctrine\Common\Collections\Collection;
 use Doctrine\ORM\Mapping as ORM;
 use InvalidArgumentException;
 use Symfony\Component\Serializer\Annotation\Groups;
+use Symfony\Component\TypeInfo\Type\NullableType;
+use Symfony\Component\TypeInfo\Type\ObjectType;
 use Symfony\Component\Validator\Constraints as Assert;
 use Symfony\Component\Validator\Context\ExecutionContextInterface;
 
@@ -95,7 +97,7 @@ class Project extends AbstractStructuralDBElement
     #[ORM\ManyToOne(targetEntity: self::class, inversedBy: 'children')]
     #[ORM\JoinColumn(name: 'parent_id')]
     #[Groups(['project:read', 'project:write'])]
-    #[ApiProperty(readableLink: false, writableLink: false)]
+    #[ApiProperty(readableLink: false, writableLink: false, nativeType: new NullableType(new ObjectType(self::class)))]
     protected ?AbstractStructuralDBElement $parent = null;
 
     #[Groups(['project:read', 'project:write'])]