Apparently this has existed for a few years now. Don't even ask.
Fixes WORLDGUARD-3611, WORLDGUARD-3476.
Potentially fixes lots of other issues with fireballs as well.
Other settings and so on seemed to have covered a lot though.
Old Bukkit code can still be found in the worldguard-legacy folder
and built with `gradle worldguard-legacy:build`. Hopefully nothing
got lost in the gradle-ization.