I love this plugin and I would love for you to update it for Minecraft(papermc) 1.21+. I will support you when it actually comes out.

An Excellent plugin for my server(with not very technically minded minecrafters). Works as intended, except underground in structures. For some reason the air blocks in structures stop the light block from spawning, like kelp or sugarcane. Not sure if this is fixable, but I figured I'd tell you. Thanks so much for your great plugin!