Just here to add that for me the bug might be manifesting in a slightly different way:
Indeed, only Human Skeleton gets a bestiary entry; none for Orlan, Dwarf, etc. No bestiary entry for Revenant. Not sure if it's supposed to be under Skeleton or not. No experience for Revenant. Or at least, not when I checked after killing those in the hallway leading to the holding cells. How many revenants are required to complete their bestiary entry? Perhaps I killed enough in the watery area where you first encounter them to fill it, so I actually did receive xp for them when I should have.