EDIT: 9/20/17 Further experiments. I no longer believe it is snow and rain that triggers the snow layers to disappear. I caught the layers disappearing BEHIND the game menus when I was toggling the weather cycle to "on". Please fix!

Pre existing snow layers only stack 3 high and then convert to automatic full blocks. This was noticed AFTER xbox one edition map is converted to new MC version. See pics. 256 MB is the new version after converted. 1.93 is before i converted (and looked much nicer before on xbox edition)