Please check if a similar issue has already been reported.

• I checked this type of issue has never been reported.

Please check you're using proper versions.

• I checked all of them in the right version.

Please check if this issue's from out of our area

• I understood the problem.

The name of the mod

https://www.curseforge.com/minecraft/mc-mods/betternether/files/4971478

After all of these, please check if you're just pressing the ok buttons to skip this process.

• I read the checklist and I promise I'll provide all the information that is needed to fix the issue

Minecraft Version

1.20.1

The Issue

• Forge 47.3.7
• better-nether-9.0.10.jar
• epicfight-forge-20.9.2-1.20.1.jar
• bclib-3.0.14.jar
• Connector-1.0.0-beta.45+1.20.1.jar
• fabric-api-0.92.2+1.11.8+1.20.1.jar

Equipping any armor piece crashes the game when the Epic Fight model is present. This only occurs when the mod BetterNether is installed. Rejoining the world will result in the same crash so it permanently bricks the world. Interestingly, Epic Fight is the one causing the crash with the following message:
java.lang.ClassCastException: class net.minecraft.client.player.LocalPlayer cannot be cast to class net.minecraft.world.entity.decoration.ArmorStand

Crash Log:
crash-2024-08-25_23.56.08-client.txt

Console Log:
latest.log

I found a thread with the same issue on the EF discord, but they never found the bottom of the issue:
https://discord.com/channels/955784714264932362/1275887389277159475

Steps to Reproduce

• Install the mods from the list above
• Wear any armor piece
• Expect crash, world is now bricked.

Do not click the link highly likely its malicious

Issue related to sinytra, we don't support them, you can either wait out a fabric port or try and see what's causing this for yourself.