[Neus]

I'm still not sure what causes this, but I added a queue to empty_z requests so that there is absolutely no chance that it could be something loading to the same z level and causing issues that way. This change should also rule out the possibility of houses being loaded 'into' dungeons; for both of them, I'm not sure if the issue is resolved, but this way we can start marking off possibilities.

That said, if this happens again after the next update, please report it again. Same with the house bug.