[Cursor] ReferenceMany sort mapping not working

I have a document like this:

/** @Document */
class Page
{
/** @Id */
protected $id;

/** @ReferenceMany(sort=

) */
protected $blocks;
}

If i have well understood things, i can do:

$blocks = $dm->getRepository('Page')>find($id)>getBlocks();

blocks should now be sorted by $order property.

This behaviour doesn't seems to work (or maybe i'm missing something).
In the attachment there's a test case

i made the priority major because in my case i haven't found a workaround (i'm using nested referenceMany, a child can have children, which can have children, ..).