getRelatedItems() always return an empty array when using ATLink on Plone 4.3.7

Hi all,
i think there is something broken for related items field of the ATLink object.
In fact, despite the field is populated, the method getRelatedItems return always an empty array (trying with a full Object not a Brain).

This seem to happen only on Plone 4.3.7.

I'm using this configurations:

Plone 4.3.7 (4311)
CMF 2.2.9
Zope 2.13.23
Python 2.7.9 (default, Mar 1 2015, 12:57:24) [GCC 4.9.2]
PIL 2.9.0 (Pillow)

Finally i found a workaround, there is another function called getRawRelatedItems() that returns the list UIDs. However honestly i still don't know why the other function doesn't work.