Names of old worlds appear as "Temp"

When looking at the Worlds list screen, the names of all Worlds created before version 0.6.0 are "Temp". This also happens when saving a Server's World in versions 0.6.0 and earlier, then attempting to load them using a newer version.

What I expected to happen was...:
I expected all World names to be what I set them as.

What actually happened was...:
When looking at the Worlds list screen, the names of all Worlds created before version 0.6.0 are "Temp". This also happens when saving a Server's World in versions 0.6.0 and earlier, then attempting to load them using a newer version.

Steps to Reproduce:
1. Create a new World using version 0.6.0 or earlier
2. Name the World
3. Enter/load the world
4. Exit the World
5. Update to version 0.6.0 or newer
6. Open MC:PE and go to the World list screen