Cannot raise Ravenous Macerator as spectre

Tried to raise the Ravenous Macerator as a spectre and, whenever I target the highlighted corpse and use the skill it raises a different monster, usually is a monster that is natural to the map that is raised instead of the Ravenous Macerator.
Tried with 2 different characters and in different maps with no success.

Steps to reproduce is: Shift into nightmare, look for the right monster, cast raise spectre on it.

Just recorded a video of it in another character.
https://youtu.be/9PmVo8thTyU