We're unable to get this working after the Rust update on any of our PVE servers running on Carbon.
On my personal Oxide server I decided to add the plugin and do a quick test with the same configuration we use on our PVE servers and my map was flooded with zombies all around instantly during night time. Also everything was working before the update on the said Carbon PVE servers fine.

Maybe Carbon did some changes you need to account properly. Please look into this because it's the top used plugin on our servers. Thanks!