I go to exit and save my worlds progress then after its done and i get sent to the world selection screen i then turn my console off, which this i do evertime and it never done this besides 3 other times in previous versions, but the next day i get back on to go back to the world to find it gone. 

Also i would show the problem but having a picture of the world selection from yesterday is kinda impossible for me to get at the current moment.