Maybe someone else can confirm, but I think with Sage it has always been the case that with pets and companions, you displace them.
What Sage does is auto-swap when in plain ADOM you would get a message of the "Do you really want to attack the *foo*?" sort. With pets, you don't get that message (you displace them instead) and Sage isn't supposed to change anything.
So if this is only for pets/companions/slaves, I see no bug. If this makes you displace goodwives and the like, then it sounds like a bug, yes.