Nikolay

> Is this breaking anything? it does not look aesthetically pleasing, besides, if you try to make a public relay for different users, the skin starts to be a noticeable...

I understood what the problem with mcpack - instead of "name" and "folder_name" in the manifest for some reason "description" and "name" were used 

Thanks a lot! If anyone is reading in the future, here is a working solution from Kastle: https://github.com/Kas-tle/Network/blob/13ba1e504844878e63003ec644315e8524e2cd2f/transport-raknet/src/main/java/org/cloudburstmc/netty/handler/codec/raknet/client/RakClientOfflineHandler.java#L189-L200

thank you very much, using the password solved the problem, after that there were no problems logging in using the msa code