Player/Entity and armour invisible

This beta is one of the most buggiest ones(except the one before this one where the game is COMPLETELY unplayable whatsoever), when I'm playing the game's split screen function, my character is invisible and cannot be seen by the other player and I can't see chests while the other player can see chest but cannot see entities(mobs, animals etc).Btw, in the image below, we BOTH are wearing armour but neither of us are seen wearing them in game.(I've re-written this because you guys said I stated 2 bugs in one page so I decided I will re-write them separated)