Problem/Bug WorldGuard blacklist not working for skulls

It literally works for every other block, just not heads. I made sure there were no other plugins interfering, so it has to do with WorldGuard. I understand the config system perfectly, and I have permissions working perfectly; I also tried on-place. I hope any of you know a solution to this, but I've got nothing else.

[skull]
ignore-groups=owner
on-use=deny

EDIT: nevermind, i fixed it, I just needed to include a playerinteractevent and if (item == Material.SKULL_ITEM) return;