This is a problem started at the beginning of bedrocks release. To start with just joining 2nd player may set there skin to a default skin. (All the time when joining for first time after account has been signed out and logged back in.) Although there is many problems with split screen the biggest is that when travelling in multiplayer, chunks usually don’t load and end up crashing into invisible walls that kill the player most of the time. (Please get this fixed it has been happening to many times forcing the player to have,[keep inventory on] just because of this problem.) Thanks for reading.