I 100% sure that at least last boss from Blackheart Haven can't transform you into a skeleton if you are in a werewolf form. What about, let's say, Fungal Grotto 2 ? The boss who summon 4 dudes, group need to kill one of them to free group member.
Would surprise me if an werewolf can not be chained. Fungal 2 also has the spider cave, as I understand this reset the boss, it happens if the three outside dies.