@AlsoLoad annotation causes exception when used together with Embed/Reference annotations

{
  "_id": "4c6936bf0f9d50300d000000",
  "c": {
    "tmp": "tmp"
  }
}

/** @Document(db="tests", collection="tests") */
class a
{
    /** @Id */
    protected $id;

    /**
     * @EmbedOne(targetDocument="b")
     * @AlsoLoad("c")
     */
    protected $b;
}

/** @EmbeddedDocument */
class b
{
    protected $tmp = 'tmp';
}

$a = $dm->loadByID('a', '4c6936bf0f9d50300d000000'); // will throw an exception: Property "b" in "a" was already declared, but it must be declared only once