For some reason it happens to me several times that the server players load a new zombie entity that crashes the sv, I have solved it by writing a /kill @e[type=zombie] each time.
I will share some of the crashes that have happened, it is important for me to solve this, I hope that anyone can help me, thanks.
By the way, Luna Pixel staff told me that it's because of this mod. That's why I make the discussion of the issue here.
crash2.txt
crash1.txt
crash3.txt

I see this is for 1.16, sadly I'm not supporting this version anymore and just supporting the 2 latest versions as this requires a lot of time from my side. This should be fixed on latest versions