Hi, I don't know if I need to post this here or on their pages. If the latter, then I will do so.
Subsurfaces adds "elevators" to move items between surfaces that it adds, and I've noticed that I have quite a few "elevators" beyond the vanilla underground belts. I was intrigued, so I checked: "Floating Bioluminescent transport belt" as well as just "floating" and "bioluminescent" versions.
My belief is that either this mod, or those two mods, or all three are using scripts to generate these. I just have to narrow it down to who is doing is so I can report it there.
If you aren't generating these, let me know. I'm posting under all three to see if anyone knows. (or, I would, except Tenebris Prime requires me to create a GetHub account as well... so...)