Why don't vampire autonomously drink inventory items?

Recently noticed when i started having two vampires in household, that despite beeing really low on thirst my vampire didn't drink any the plasma packs or plasma fruits in the inventory. Instead just stood around pointing out there was a first problem. Is it anything anyone else encountered, because it's at least to me is a bit of a joy killer micromanaging the household, since thirst can drop somewhat fast at times so is a bit frustrating to me when they don't use any their inventory options, if there not something around they can "bite".

But again not sure if it's a singular problem just for me or if anyone else experiencing it too, if that being case hopefully it would be something that could come on a patch list for future?