Concurrent Chunk Management Engine - Forge

C2ME-Forge 0.2.0-forge.9.4 (Minecraft 1.20.1) - build 2026-09-18

Hotfix for forge.9.3 - makes the server-freeze fix hold against other mods' hooks, and fixes a crash with mods that spawn entities from inside chunk generation. Nothing else.

Fixed
• Permanent server freeze - the forge.9.3 fix, made to hold. That fix handed a chunk back to code asking for it from inside the chunk's own load, but it hooked beside one chunk request, and another mod's hook on the same request could remove it without a trace. The protection now wraps that request so it stays in place whatever else hooks it, looks the chunk up where the loading holder actually lives, and announces itself in the log once the server is up ("re-entrant chunk load protection is active"), with an error line instead if it ever fails to run. Kill switch: -Dc2me.disableModule.fixes.general.deadlock=true
• Crash or hang entering Meulti's Backrooms, and with any mod whose chunk generator adds entities straight to the level. Entities spawned during generation must go through the generation region (stored in the chunk, spawned when it becomes full); adding them to the live level from a generation thread corrupts the entity index and the server dies with a NullPointerException in LongAVLTreeSet.add. Such adds are now routed through the region the way vanilla routes them, and one warning per entity type names the mod that did it. Kill switch: -Dc2me.disableModule.fixes.worldgen.entity_add=true
• Both faults are inherited from upstream C2ME

Configuration
• Any single mixin can be switched off for testing: -Dc2me.disableMixin.<ClassName>=true

Chunk system only - generation order and worldgen output are unchanged, existing worlds unaffected.
Drop-in update - recommended for everyone on forge.9.x, and required if you use Dimensional Doors, Better Chunk Loading or Meulti's Backrooms. No config changes needed.
Support: https://discord.gg/s7BYs6Njj5