When I enter the saves folder and check my created npc, updateSkins is locked as false. If I change it to true then reload the plugin, updateSkins is set to false again and therefore cannot be changed.
I'm pretty sure this correlates to my current problem where I can't change my npc's player skin by using /npc skin (My Username). If I am incorrect about this assumption please let me know.
FYI I am NOT using a cracked server, online-mode = true. (Don't block me from posts 🥺)