Does a butler have to stay human? Occult butler

I think some if not all service npc cannot become an occult, if you have co-worker in active profession who become a vampire they wont show to career lot anymore, but I see vampire host in accolade once and vlad showing up as doctor but just stand there in front of the hospital and luna villareal (vampire) as well.

I've tested many NPC careers with vampires (as I love making my own NPCs), ones like pizza delivery, repair and maid seem to work for all sims (but may have other issues), librarian absolutely does not work with vampires, sadly. Setting a bartender is always iffy, but vampires get randomly selected for the job all the time. They suit the GTW NPC careers perfectly, one of my favorite waiters is a good vampire sim with superspeed run enabled, lol. I haven't tested much with aliens, but now I'm feeling inspired to, especially since I've been making tons of alien sims lately.