I don't really understand why, but the decapitated heads and arms disappears after a few seconds in battle, removing any immersion that should come with the DLC. There could be a slider for how long the dismembered limbs lingers, from 10 seconds to infinite. I hate seeing a lord losing a limb as they die, only for it to disappear. Making you wonder what happened.
PLS CA, this is a big bother of mine and I have not found any mods to make it happen.