YapiFix

YapiFix — Universal Worldgen Crash Fix for Forge 1.20.1

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

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

What Changed in Version 2.0.0 Earlier versions of YapiFix manually patched a small number of known mod conflicts.

Starting with YapiFix 2.0.0, the mod uses a broader, universal stabilization system. It normalizes feature ordering after biome modifiers have finished running, helping prevent feature-order cycles even when the exact conflicting combination of mods is unknown.

What YapiFix Does

• Helps prevent FeatureSorter and feature-order cycle crashes
• Applies a deterministic feature order during world generation
• Runs as a final compatibility pass after other biome modifiers
• Preserves 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 files, missing registry entries, invalid configured features, or mixins from other mods

Useful for Modpacks Containing

• Atmospheric
• Biome Fest
• Aromatic
• Blueprint-based biome mods
• Large numbers of biome and worldgen mods

Compatible With

• Existing worlds
• New worlds
• Datapacks
• Large modpacks

Target Minecraft Version

• Minecraft Forge 1.20.1

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

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

Usage & Permissions

All rights reserved.

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

If you use YapiFix in a public modpack or on a public server, a mention or message is appreciated, but not required.

Distribution

This mod is officially distributed only through CurseForge.

Reuploads to other platforms are not permitted without explicit permission.

Linking directly to the official CurseForge page is always welcome.

Updates & Support

YapiFix is updated based on user reports and compatibility requests.

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

Credits

Special thanks to Saorise for the updated logo.

Community

Follow the development of the mod, share ideas, report issues, and stay up to date here:

YouTube: https://www.youtube.com/@YAPILabs

Discord: https://discord.gg/KYGyy9jFCz