Chunksmith 2.0.1 — Everywhere, and now with a peek under the hood

2.0.0 killed the 3+ year pre-generation memory bug — worldgen entities that piled up until your server OOM'd or watchdog-crashed. 2.0.1 brings that same fix to every version of Minecraft Chunksmith supports, and adds a way to watch it work.

Now fixed across the board

The worldgen entity-retention fix is no longer just for the newest Minecraft. 2.0.1 backports it across the entire supported range — Minecraft 1.20 through 1.21.11, plus 26.1.x and 26.2 — on Fabric, NeoForge, and Forge. Every loader, every version, feature-equal. If you pre-generate, your RAM is safe no matter which build you run.

New: /cs debug

Ever wondered whether the unload fix is actually keeping up on your hardware during a big pre-gen? Run /cs debug. It turns on a once-every-5-seconds line in the server log showing the live entity-manager state per dimension — tracked entities, sections, chunks queued to unload, and how often the fast-path skipped a redundant disk read. Run /cs debug again to turn it off.

It's off by default — a normal install stays completely silent. It's there for the moments you want certainty.

Under the hood

The fix recognizes when a freshly generated chunk has no entities saved to disk to merge with — in which case the read it was stalling on is pure overhead — and skips it, letting the chunk save and unload immediately. When real saved data exists, the normal safe read-and-merge still runs, so no entity is ever lost. (Pre-1.21.11 builds reach the entity region through the older storage layout; same behavior, same safety.)

Available for Minecraft 1.20–1.21.11, 26.1.x, and 26.2 — Fabric, NeoForge, and Forge. Pick the jar for your version and loader.