So, I don't know why or how, but in multiplayer, the skin's second layer isn't rendered.

Notes:
-Tested with no other mods except the fabric api
-The server doesn't have the mod installed

concern

Does this happen in singleplayer?

Nope

Does the server have Spigot? Spigot breaks this mod.

Yes, it was running on Spigot.

Yeah, unfortunately there's nothing I can do about this. Sorry :(