Versions
WorldEdit version: FAWE-581
WorldGuard version: 7.0.4
Platform version: Paper 1.16.5 (465)

Describe the bug
Using the mob-spawning deny flag doesn't block mob spawning.
Using deny-spawn flag doesn't block mob spawning either

To Reproduce
Set the mob-spawning flag to DENY on __global__
Make sure no other regions exist
/kill all mobs of one type (in my example I tried cows, sheep, rabbits, etc..)
wait a little bit
re-run previous kill command - new mobs have been killed which should be impossible (these are natural spawns, I even teleported to them to verify that other players were not somehow creating mobs)

Expected behavior
No mobs should be able to spawn when setting these flags

Screenshots
N/A

Additional context
Hypothesis: Some other plugins that we have are possibly conflicting with wg? Here are some of the plugins that I am uncertain about regarding worldguard mob spawning compatibility: FAWE, Insights, Lands, WorldGuardExtraFlags, Multiverse-Core (multiverse has spawning settings, but I tried force disabling mobs there too and no change..)

1. fawe isn't supported, it's known to break various parts of WE/WG (though I haven't heard of it breaking mob spawning yet)
2. if other plugins are breaking things there's not much we can do about it
3. can't repro under proper environment anyway
4. your repro steps don't even prove that WG failed to prevent a mob spawn. you could possibly be loading chunks with existing mobs as well. correct way to test if it's cancelling the event would just be /summon cow or w/e