Issue: No boss dungeons or spawners are spawning, and invading bosses very very rarely spawn

I'm playing on a server with friends with a ton of random mods. I've noticed that in the ~20 hours people have been playing, only 2 invading bosses have been reported. Additionally, after flying around in spectator and loading in new chunks, I can confidently say that no structures are spawning.
Affix items do occasionally spawn on mobs and in chest as normal though, as well as gems dropping from mobs.

I'm wondering if it could be that another mod is preventing it from generating structures. Or that maybe the id for the overworld was changed and makes it so Zenith is unable to generate.

Version: Fabric 1.20.1

List of mods that influence world gen:

• Additional Structures
• applied energistics
• all the trims
• architecture
• botania
• deeper and darker
• dungeons and taverns ancient city overhaul
• dungeons and taverns pillager outpost rework
• dungeons and taverns stronghold rework
• extractinator
• end remastered
• incendium
• sky villages
• tech reborn
• travelers backpack
• zenith

Hmm... odd
It uses a vanilla datapack for structures so anything that is disabling it from spawning must break the datapack...