Почему не работает фильтр apiplatform?

Question

[Hfnas]

/** @ORM\Entity(repositoryClass=SessRepository::class)
 * @ApiResource(
 *     collectionOperations={
 *          "get"={
 *              "normalization_context"={"groups"="sess:list"}
 *          },
 *          "post"={
 *              "normalization_context"={"groups"="sess:list:write"},
 *              "security_post_denormalize"="is_granted('SESS_EDIT', object)"
 *          }
 *     },
 *     itemOperations={
 *         "get"={
 *              "normalization_context"={"groups"="sess:item"},
 *              "security"="is_granted('SESS_READ', object)"
 *          },
 *          "delete"={
 *              "security"="is_granted('SESS_DELETE', object)"
 *          },
 *       "patch"={
 *              "normalization_context"={"groups"="sess:item"},
 *              "security_post_denormalize"="is_granted('SESS_EDIT', object)"
 *          }
 *      }
 * )
 * @ApiFilter(ExistsFilter::class, properties={"orders.user"})
 */
class Sess
{

    /**
     * @ORM\OneToMany(targetEntity=Orders::class, mappedBy="sess", cascade={"persist", "remove"})
     * @Groups({"sess:list", "sess:item"})
     *
     */
    private $orders;
....
}

не работает путь
/api/sess/1?exists[orders.user]=false