This is really annoying for admin's or OP's to take negative heal damage in regions. Please make it possible to automatically trump this when user is OP.

Better (IMHO anyway) would be a permission that could be added to groups to give immunity to the damage.

do they have godmode on by any chance?

(there's a config option that will autogod people with a certain
permission and ops get all perms by default (another config option), a
combination of this could be doing it)

already tried all three god modes that we have on our server, and it still damaged me. including worldguard's special god mode permission

wait i totally read this wrong, i read they SHOULD but DIDN'T not the
other way around.