Random “Exploit Protection” stopping players from moving skulls in inventories.

Just started getting this error. Probably has to do with updating to Paper 1.21.11 bc I didn’t have this issue before.

“[Exploit Protection] ML_Infinite: Custom skull with modified textures detected and removed.”

I don’t exactly have an exploit protection plugin and it doesn’t state anywhere in log which plugin is responsible for this so I’m kind of clueless.