World Fix
by a_JiaoZi
World Fix is a Fabric utility for servers that filters repeated block-data log messages and can throttle ticks in idle worlds, published for 1.21.1 – 1.21.11.
What it does
Modded servers often keep old block data after mods are removed, upgraded or migrated, and the log then fills with repeated warnings about unknown block registry keys and failed block entity loads. World Fix filters a selected set of these repeated messages so that other log output stays readable. It does not replace unknown blocks or touch chunk contents.
On servers that want to repair affected data, World Fix offers a further step. It can restore removed mod blocks, fix corrupted NBT and delete broken blocks, so chunks can load normally again. An optional idle-world throttle lets the server skip most ServerWorld ticks in dimensions without nearby players, which vanilla Minecraft does not do by itself.
Server owners install it, and players connect with no copy of their own. Builds are published for Fabric alone, across 11 release versions. The code is not open source; it is released under All rights reserved.
Key features
Repeated log filtering
Selected repeated messages about invalid or unknown block data are suppressed, leaving other server log output visible.
Block entity warning filter
Repeated warnings about block entities whose data cannot be used are filtered from the console.
Missing block repair
Removed mod blocks can be restored, corrupted NBT fixed and broken blocks deleted, so affected chunks load correctly.
Idle-world tick throttling
An optional setting lets the server skip most ServerWorld ticks in dimensions with no players nearby.
Compatibility
Latest build for each game version and loader.
1.21.x11 of 11 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Server owners running modded Minecraft on Fabric who handle old or missing block data after changing their mod list.
How it compares
Jukebox Fix is client-side only, released under the MIT License and published for 1.21.6 – 26.2, so it does not touch servers at all. Data Reload works on either side, released under the MIT License, for 1.17.1 – 1.21.1. Stack Size Fix is client-side only, released under the CC0 1.0 Universal license and supports both Fabric and NeoForge, while World Fix is server-side only and released under All rights reserved.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| World Fix | Fabric | 1.21.1 – 1.21.11 | Server-side only | 2026-06-25 |
| Jukebox Fix | Fabric | 1.21.6 – 26.2 | Client-side only | 2026-08-18 |
| Data Reload | Fabric | 1.17.1 – 1.21.1 | Client or server, optional | 2024-07-08 |
| Stack Size Fix | Fabric and NeoForge | 1.20.5 – 26.3 | Client-side only | 2026-04-01 |
Questions
Does World Fix need to be installed on the client?
Which loaders does World Fix support?
Does World Fix change block data on its own?
In the catalog
World Fix is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 19,862 mods support Minecraft 1.21.11.
More from a_JiaoZi
Similar mods
What the author says
例如，世界存档中仍保存着某个已移除模组的方块，而服务器当前没有安装该模组时，加载对应区块或 section 可能会反复输出相关报错。World Fix 可以减少这类重复刷屏，让服主更容易查看其他重要日志。 它不会恢复已移除模组的方块，不会修复损坏的 NBT，不会自动删除异常方块，也不能保证所有受影响区块都能正常加载。根据具体情况，Minecraft 或其他模组可能会把未知方块数据替换为默认方块状态。
Official listing
- Modrinth page
- modrinth.com/mod/world-fix
- Owner
- a_JiaoZi
- Published
- 2026-06-25
- Updated on Modrinth
- 2026-06-25
- Facts verified
- 2026-10-15