Are there any other MODS installed?
If so, have a look.
Could it be that there is something wrong with mod sequencing? The next boss will check the classification.
If not, it may be because of mod conflict.
Don't load other MODS, just add this MOD to see if the game can run normally.
If it doesn't work, I think you must change the mode ... (if you find a better solution, it's ok ...)
If possible, you can add 3 to the mod, check it out (including this mod all the time) and see which conflict it is.
If you find it, you must make a choice ...