无法从MongoDB，Doctrine ODM中检索字符串和嵌入数据

My Documents

/**
 * Class CellCoordinates
 *
 * @package Community\UserBundle\Document
 *
 * @MongoDB\EmbeddedDocument
 */
class CellCoordinates
{

/**
 * @MongoDB\Float
 */
protected $latitude;

/**
 * @MongoDB\Float
 */
protected $longitude;

and

/**
 * Class CellStatus
 *
 * @package Community\UserBundle\Document
 * @MongoDB\Document(collection="cell_status")
 * @MongoDB\Index(keys={"cell_coordinates"="2d"})
 */
class CellStatus
{

/**
 * @MongoDB\Id
 */
protected $id;

/**
 * @MongoDB\Int
 */
protected $cellId;

/**
 * @MongoDB\String
 */
protected $type;

/**
 * @MongoDB\Timestamp
 */
protected $timestamp;

/** @MongoDB\EmbedOne(targetDocument="Community\UserBundle\Document\CellCoordinates") */
protected $location;

I'm trying to retrieve data from Documents in this way: $cellStatus->getType() and $cellStatus->getLocation()->getLatitude(),but got nothing. All that ways returns null.

But I can see data in that fields, when I'm querying mongoDB via shell.

What I did wrong?

This issue was mysteriously resolved after update.