when I run /reload the game will sometimes crash

crash report:
https://pastebin.com/Q4M9SvTW

modlist.txt
modlist

That's a CME on a pillager, without enough indication on cause. I don't even know that AS touches those.

I've gotten it multiple times, on pillagers, armor stands, and sheep.

Yup, but as a concurrent modification exception, it means more than one thing is trying to modify the entity. I really don't see how AS is triggering this with the information available, especially with the entities being cycled through when triggering a datapack reload command.

you are correct, it was advanced rocketry