The bug:
This bug happned for some days. In my world , Iplay with my brother. He is player 2. He isn't a Bad player so he had very good things in his Inventar. Than we went offline.The reason was a not really import acitent , so we couldn't go online. Player 2 spawnt at our Worldspawnpoint and he has no XP and things. So he lost bis Inventar. Some days later we went online and he had the Inventar bevor we went offline.
So you reproduce the bug'
1) Go in a world as a second player
2)Do some things in your Inventar like a stack Earth vor get some XP
3) Left the world
4) Go offline
5) Go again in your world AS second player
6) so you lost the stack earth or the XP
7) left the world
8) go online
9) go in your world AS second player
10) So you schould have the stack earth or the XP

This bug is not at player 1.
The bug only work at consoles on the TV
(Sorry for my Bad englisch. I normaly talk german )