I have my survival world in 18w16a, but when I copy it (to back it up) and load up the backup (to make sure the snapshot will work), the player data seems to be off. When I open it is 18w16a I load in where I'm supposed to, but when I load in on 18w22b it seems that my player data + my ender chest data is out of date.

Also in the 2 screenshots you can see how different the inventories look + I am in two completely different spots.