In 1.18 Mojang redid a lot of structure-related things. Fabric removed the biome modification API. The wiki page states you should use datapacks for surface structures.

For our use case in Tale of Kingdoms, this is not appropriate. We need to be able to:

• Modify spawn chances
• Modify entity spawns
• Add pieces manually in positions manually

This is why it is required that we process our structures via code and not json files. Datapacks cannot do any of this.

I've tried looking into it for several months now, but haven't been able to find any replacement methods. If anyone else does know, your help would be appreciated...