ModsJava
Bundle Dupe Fix
Java mod listed for Minecraft 1.21. Downloads from the MC Java Mods app on Android.
⬇ Download on ModrinthFixes bundle duplication exploits by throttling bundle actions, blocking risky held-bundle use packets, detecting ClickSlot/entity/chest-vehicle lag spam, and resyncing player inventories to prevent netty lag/kick based dupes.
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21.4, 1.21.9, 1.21.10
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
File checked by MCModsHub
- Ships as bundle-dupe-fix-1.3.1.jar — drop this file into the mods folder
- Download size: 15 KB
- Download link checked 3 Oct 2026 — working
These come from our own check of the pack file, not from the source page.