About WorldgenFeatureFix
From ModrinthFix custom world generation datapack crashes when using minecraft:lake feature ( MC-273228 and MC-272370)
WorldGenFeatureFix
> Tips: _Mojang has marked this problem as fixed since 26.1 Snapshot 6, you may don't need this mod in 26.1 anymore._
What this mod fixes?
When custom world generation datapack uses minecraft:lake or minecraft:snow_and_freeze placed feature with water, The chunk generator crashes. (See MC-273228 or MC-272370 for more details). Inspired by This pull request, This mod apply mixins to make them work.
Techinal Details
In version 1.21, chunk generation has been highly optimized, which unintentionally breaks the freeze detection of the lake feature since it may trying to access inaccessible chunks. However, since Mojang only uses the lake feature for lava lakes at now, this issue does not occur in vanilla Minecraft — but it does affect custom world generators! This mod applies mixins that fallback to getUncachedNoiseChunk, allowing the lake feature to work correctly again.
Disclaimer
However, The PR also mentioned that LakeFeature is deprecated and vanilla has moved away from using it for anything except for lava lakes. The error for unsafe chunk gets removing here is an intentional safeguard against bad code, such as that in the dead path in LakeFeature when creating water lakes. While it may appear to 'fix' the problem at hand it is not a proper solution and will cause other more serious problems to go undetected. Use at your own risk. (At least it works perfect in my server)
Highlights
From source dataGame versions
Supports 12 Minecraft versions, the newest being 1.21.11.
Loaders
Runs on Fabric, Forge and NeoForge.
Footprint
Rated a light load on a server.
WorldgenFeatureFix on Nxeon
From our catalogue- One-click install
- Supported on Nxeon Minecraft servers. We download it from Modrinth, place it, and restart the server.
- Server side
- Required on the server
- Server type needed
- Fabric, Forge, NeoForge
- Server load
- light
- Smallest plan we suggest
- Minecraft — 2 GB (2 GB RAM). This follows our own load rating above, not a benchmark.
- Latest build
- 1.0.1 (alpha), released 2025-08-10
Game versions by loader
| Loader | Game versions | Newest |
|---|---|---|
| Fabric | 1.21 to 1.21.11 (12 versions) | 1.21.11 |
| Forge | 1.21 to 1.21.11 (12 versions) | 1.21.11 |
| NeoForge | 1.21 to 1.21.11 (12 versions) | 1.21.11 |
From 5 recorded builds of WorldgenFeatureFix.
Recent builds
| Build | Released | Game versions | Loaders |
|---|---|---|---|
| 1.0.1 alpha | 2025-08-10 | 1.21 to 1.21.11 (12 versions) | NeoForge |
| 1.0.1 alpha | 2025-08-10 | 1.21 to 1.21.11 (12 versions) | Fabric |
| 1.0.1 alpha | 2025-08-10 | 1.21 to 1.21.11 (12 versions) | Forge |
| 1.0.0 alpha | 2025-08-09 | 1.21 to 1.21.8 (9 versions) | NeoForge |
| 1.0.0 alpha | 2025-08-09 | 1.21 to 1.21.8 (9 versions) | Forge |
Run WorldgenFeatureFix on a Minecraft server
Pick a server or deploy a new one above; it is installed in one click.
What kind of mod it is
From the catalogWorld generation
Changes or adds to how new terrain, biomes and structures are created.
Runs on your server
From source side supportModrinth lists WorldgenFeatureFix as required on the server. Check its Modrinth page to see whether players need it too.
Compatibility
- Game
- Minecraft
- Loaders
- FabricForgeNeoForge
- Runs on
- Serverrequired on the server
- Game versions
- 1.21.11 and 11 earlier
Verified at the source
- ✓ModrinthOfficial listing, checked 2026-10-01Open ↗
- ✓AuthorSimonShiki, as published on Modrinth
- ✓LicenseCC0-1.0Free
