Join-Table with Metadata Hydrator: no results on non existing Metadata

namespace MyEntity;

class User
{
	/** @Id @Column(type="integer") @GeneratedValue */
	private $id;

	/**
	 * @OneToMany(targetEntity="UserImages", mappedBy="user")
	 */
	protected $images;
}

class UserImages
{
	/**
	 * @Id
	 * @JoinColumn(name="user_id")
	 * @ManyToOne(targetEntity="User", inversedBy="images")
	 */
	private $user;

	/**
	 * @Id
	 * @JoinColumn(name="image_id")
	 * @OneToOne(targetEntity="Image")
	 */
	private $image;

	/**
	 * @Column(name="sort_number", type="integer", columnDefinition="int(10) unsigned DEFAULT NULL")
	 */
	protected $sortNumber;
}

class Image
{
	/** @Id @Column(type="integer") @GeneratedValue */
	private $id;
}

SELECT u, uImages, uImagesFile
FROM MyEntity\User u
	LEFT JOIN u.images uImages
	LEFT JOIN uImages.file uImagesFile

Array
(
	[0] => Array
		(
			[u_id] => 1
			[uImages_sortNumber] =>
			[uImagesFile_id] => 1
		)
)

Array
(
	[0] => MyEntity\User
		(
			[id] => 1
			[images] => Array
				(
				)
		)
)