As seen in the screenshots below, what Catacombs decide to do when they're generating in the air is quite... interesting. Obviously the stilts/support pillars are intentional, but I'm not sure they're supposed to do that -- they seem a bit long. Don't know what could be done to combat this, as I suppose it'd look weirder if those parts of the Catacombs were floating instead... maybe less/a lower density of pillars? Brilliant mod otherwise, huge kudos to you for your insane work!

Hey, glad you like the mod! This is just kinda the result of the initial design of the dungeons + the newer giant 1.18 caves. I know it's not ideal, but at this point this mod is pretty finalized so I'm going to be marking this issue as wontfix.