Offline skin packs don't render/show properly on servers/games

Me and my friend was supposed to play on my map but when my friend joins, yes his skin renders. but when i look at his phone, my skin doesn't render/show at all. it instead shows the previous skin i used or shows up as a character instead. and when i look at the player list, I'm being read as a LAN player. although it works fine on realms. is this a way to promote realms or a bug?