ToME: the Tales of Maj'Eyal

Playing a rogue in the current beta (38). I got an artifact "Fake Skullcleaver" off of the Reaver in Escape from Reknor, and now have received the actual "Skullcleaver" from Prox. They seem to be identical… Are they?

Fake Skullcleaver does not trigger Greater Weapon Focus.
Brotoq is supposed to use it instead of the real one to avoid being too nasty, but it should be should never be dropped so this sounds indeed like a bug.