Death Muffler Fix (1.21.1 — NeoForge)

A client-side fix for the Death Muffler boss bar hiding feature in <button class="wrap-anywhere text-ui-base font-medium text-primary underline cursor-pointer bg-transparent p-0 text-left" title="https://www.curseforge.com/minecraft/mc-mods/mob-grinding-utils" type="button" data-state="closed" data-slot="context-menu-trigger">Mob Grinding Utils</button> 1.1.10.

The Problem

Mob Grinding Utils 1.1.10 has a build defect: the class mob_grinding_utils.events.BossBarHidingEvent was never compiled — the published jar only contains its .java source file, without the .class bytecode.

The main mod class references this missing class in doClientStuff():

java

 

 

NeoForge.EVENT_BUS.register(new BossBarHidingEvent());

As soon as the client starts up, executing new BossBarHidingEvent() triggers class loading and throws NoClassDefFoundError, crashing client initialization.

The Fix

This mod compiles a same-package, same-name shim class (mob_grinding_utils.events.BossBarHidingEvent) into its own jar, filling in the missing bytecode. The class is functionally identical to the source that MUG shipped.

With the class present, MUG's doClientStuff() runs to completion — no Mixin, no method cancellation, no logic re-implementation:

• ✅ Boss bar hiding (Wither / Ender Dragon) works as originally written
• ✅ worldUnload listener registered (clears the cached SPIKE_DAMAGE on world change)
• ✅ XP fluid translucent render layers set
• ✅ Block color handlers registered

Requirements

Installation

1. Install NeoForge and Mob Grinding Utils
2. Drop death_muffler_fix-1.0.0-NeoForge-1.21.1.jar into your mods folder
3. Launch the game

Notes

• Client-side only; works on any server (vanilla or modded).
• If a future MUG release ships the compiled BossBarHidingEvent class, both jars will contain the same class. Since the implementations are identical, whichever is loaded first wins and behavior is unchanged — no action needed.
• This mod requires Mob Grinding Utils and will refuse to load without it.