YapiFix — Universal Worldgen Crash Fix (Forge 1.20.1)

YapiFix is a lightweight compatibility patch mod for Minecraft 1.20.1 modpacks.

It is designed to prevent Feature order cycle found / FeatureSorter worldgen crashes caused by inconsistent placed-feature ordering between biome and worldgen mods.

What changed in 2.0.0
Earlier versions of YapiFix fixed a small number of known mod conflicts manually.

Starting with YapiFix 2.0.0, the mod uses a broader universal stabilization approach: it normalizes feature ordering after biome modifiers have finished running, helping prevent feature order cycles even when the exact conflicting mod pair is unknown.

What YapiFix does

Helps prevent FeatureSorter / feature order cycle crashes
Applies a deterministic feature order during world generation
Runs as a final compatibility pass after other biome modifiers
Keeps existing targeted fixes for known problematic cases
Works as an “install it and forget it” worldgen compatibility patch

What YapiFix does not do

Does not remove biome features
Does not remove biomes
Does not disable worldgen mods
Does not fix unrelated crashes caused by broken datapack JSON, missing registry entries, invalid configured features, or other mods’ mixins

Useful for modpacks with

Atmospheric
Biome Fest
Aromatic
Blueprint-based biome mods
Large modpacks with many biome/worldgen mods

Works with

Existing worlds
New worlds
Datapacks
Large modpacks

Target Minecraft Version

Forge 1.20.1

Notes
YapiFix was created to fix real-world worldgen crashes in production modpacks.

Version 2.0.0 changes the philosophy of the mod: instead of only patching individual known conflicts, YapiFix now aims to prevent this entire class of feature-order crashes automatically.

Usage & Permissions

You may freely use this mod in private modpacks and personal projects.

If used in public modpacks or servers, a mention or message is appreciated, but not required.

Distribution

This mod is officially distributed only on CurseForge.

Reuploads to other platforms are not permitted without explicit permission.

Linking to the CurseForge page is always welcome.

Updates & Support

YapiFix is updated on request.

If you encounter a FeatureSorter cycle or similar worldgen crash that is not fixed by this mod, you may report it and I will review it when possible.