I don't know if you can fix this on your side but when I have Beast slayer along with NetherEx the Spinout mob ai doesn't work it just stands where it is and never moves or attacks at all.

I've been checking netherEx code and I seem to have found the problem (it's rather an unfortunate coincidence), I'll try experimenting with a few things to see if I can fix it without breaking anything.

This problem still exists in beastslayer-2.0.test_1.031. Is there any way to fix it?