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BugFixerUpper

BugFixerUpper fixes a few critical and non-critical bugs in the game.

FabricQuilt
Loaders
FabricQuilt
Downloads on Modrinth
77.3K
Followers on Modrinth
17
versions
15
Updated
September 27, 2026Sep 27
Published
in 2025

At a glance

Runs on Fabric and Quilt
For Minecraft 1.21.4–1.21.6, 1.21.8–26.3
Works on either side — install it in the game, on the server, or both
Latest version — mc26.3-1.11.0-fabric from September 27, 2026
License LGPL-3.0-only — free
Where it's needed
In gameoptionalOn serveroptional

Works both in the game and on the server — install where you need it

Game versions1.21.4–1.21.6, 1.21.8–26.3

BugFixerUpper is a Minecraft mod that fixes a few critical and non-critical bugs in the game.

Features

  • Whatever you suggest in the issue tracker.

Chunk loading and generation

  • Prevent passenger entities from sending game events during chunk loading/generation causing deadlocks.
  • Prevent item frames from sending sounds and events during chunk loading/generation.

Misc

  • Save vehicle passengers at their actual position (MC-263030).
  • Parrot mob spawner blocks treat all air types equally (MC-232359).
  • Curse of vanishing does not apply to items inside donkey/mule/llama chest slots.
  • Leads pull on mobs and boats that the player is riding (Install on client!)
  • Regenerating exit end portal does not drop torches
  • Ghast balls, wind charges and shulker bullets do not have an extended click box for creative mode players (Install on client!)

Structure blocks

  • Structure blocks load paintings at the correct position (Thanks to BluSpring) (MC-102223).
  • Structure blocks with combined mirror and rotation place paintings and item frames with the correct rotation.

Tick freeze

  • Prevent players from unfreezing other passengers in multi-seat vehicles during tick freeze (MC-268358).

Installation

Must be installed on the server to work in multiplayer. For usage in singleplayer worlds, the mod has to be installed on the client.

  1. Download the mod from Modrinth or CurseForge.
  2. Place the downloaded .jar file into the mods folder of your Minecraft directory.
  3. Launch Minecraft with the Fabric mod loader.

Usage

  • Install the mod and be happy that some bugs are fixed.

FAQ

How to install BugFixerUpper?

Install Fabric for your Minecraft version, download BugFixerUpper for the same version and loader, put the file into the mods folder and launch the game with the loader profile.

Which Minecraft versions does BugFixerUpper support?

BugFixerUpper has builds for Minecraft 1.21.4–1.21.6, 1.21.8–26.3.

Is BugFixerUpper needed on the server?

Works on either side — install it in the game, on the server, or both

License and source
GNU Lesser General Public License v3.0 onlyfree to use and share; changes to the mod itself must be published under the same license
Original — Modrinth↗Files unchanged, verified with SHA-512Is this your mod? For rights holders

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