I also noticed whilst testing that whilst mezzed by an operative, the debuff doesn't show what category its in (mental, physical, force or tech) It just says 'asleep'....
Shadow/assassin is mental, mando sap is mental too. I think where the problem lies is the fact that they havent assigned tranquilizer to a category yet, lol. Wish they'd hurry up because it's a bit irritating D;