Currently playing on 1.20.1 mod version 1a. A couple of my friends have not purchased Minecraft so i created an offline server. The people who have original game and are using curseforge to join server see the skins see the skins of others normally. but the people using cracked launchers see old skins of some people and normal (current) skins of some. For example: My friend sees my other friend's 1 year old skin instead of the new one he just updated on minecraft.net. But we (people with original game) can see it.