Describe the bug

This originated from dzwdz/chat_heads#117

Loading a legacy skin crashes on Forge (using ForgeV2_14.21), but not on Fabric, using (Fabric_14.21).

Steps to reproduce

1. In CustomSkinLoader.json, place `LocalSkin` first in `loadlist`
2. Put any legacy skin like https://mskins.net/en/skin/renagabe-w1RoX at LocalSkin\skins\USERNAME.png
3. Load a world and wait for the skin to load - the game crashes instead

Link to crash-report if applicable

https://mclo.gs/KfhXFa5

Link to CustomSkinLoader.log if applicable

https://mclo.gs/nxW5C6L

Link to latest.log if applicable

https://mclo.gs/EFN1Jyx

[Only Forge User] Link to Forge Log if applicable

No response

Mod Version

14.21

Minecraft Version

1.20.1

Minecraft Launcher Name and Version

PrismLauncher 9.1

Mod Loader

Forge

Operating System

Windows

Before submitting a bug report

• This bug wasn't already reported (I have searched bug reports on GitHub).

• This is a valid bug (I am able to reproduce this on the latest dev build).

• This problem is triggered in the latest version of the mod (if not the latest please upgrade the mod first)

#315