Description:

Hello, I'm a modpack developer and I did extensive testing for spawning structures in The Beneath. I noticed that either structures will not spawn at all, or they spawn in very strange locations (on ceilings, inside of walls, etc). I tested Ruins, Additional Structures, Roguelike Dungeons, Ice and Fire, and Recurrent Complex. All of those mods add a config option for structures in other dimensions (and yes, the ID I used is correct), but none of them spawned structures despite vastly increasing the spawn rate. They also all worked in the Overworld.

It's worth noting that some structures like Quark's dungeons (that replace vanilla dungeons) and broken Nether portals will spawn. I do believe this is an issue with The Beneath and not an issue with the other structure mods.

Crash report:

N/A

Affected versions ("latest" is NOT a version):

• Minecraft: 1.12.2
• Forge: 14.23.5.2838
• The Beneath: 1.12.2-1.6.0

Latest log file for when the issue was present:

N/A

Have you enabled "Other Mod World Generation" in the beneath config? That's usually the limiting factor to things from other mods not generating inside The Beneath.
If that does nothing, you might be out of luck unless those structure mods allow you to configure at which height the structure generates, or whether or not it should generate at the surface (which won't work in The Beneath as the dimension is a cave).