Player(s) who joined a local world lose progress after saving and quitting

Description
Sometimes, when playing on a local world and on one console (in this case Xbox One), the player who joins the world can lose progress after saving and quitting the world.

Steps to reproduce

1. Create a world (player 1)
2. Let a second player join the world on the console (split screen play)
3. Play for a while
4. Player 1 saves and quits the game
5. Close Minecraft and restart it.
6. Re-do steps 1 and 2 and sometimes player 2 has lost progress

Notes

• This is most likely caused due to a crash, even if it occures after saving and quiting. I just had a game crash when in the title screen and my girlfriend lost about 1,5 hours of progress.

The game crashes a lot, and until the crashes and this bug is fixed it's impossible to play with multiple players locally. Losing progress is really demoralizing.