When you are looking at this image:
the player is standing behind the tree. I know that can be accomplished by drawing the background first the player second and the upper tree part after that.
The thing is in the actual tileset there is only one tile that combines the background and the upper tree part:
So how is it possible that there are multiple z-indices within one tile. Or is the game somehow extracting the upper tree part from the base grass texture and draw them like described earlier?