When you go underground, then restart the app; you spawn above-ground. (and on top of any structure
just like a previous version bug)

What I expected to happen was...:
When I leave a map, I expect to spawn in the same place when I return.

What actually happened was...:
I spawn on the main ground level and I have to go all the way down again if I'm mining. (If I'm in my house, I spawn on the roof)

Steps to Reproduce:
1. Dig down, then horizontal underground and stay there
2. Close and restart the app
3. Open the map and you will be up top above where you were underground