I'm not sure if this is a bug, but I thought I'd report it.  Two villages spawned right on top of each other and some of the items merged (a desert house with a stone church). Some of the buildings were sort of cut in half by gardens from the other biome (so they were partially open without complete roofs or walls. There is also a floating torch just hanging out in the air (which is visible in the screenshot). I've never seen anything like this. It's really fun - but I thought I'd let you know in case it's a bug in the beta.