This is pretty minor in comparison to most bugs but I figured I'd mention it in case it's a symptom of something larger. I came back to Round Hill after running around the map for some time and noticed some weird "sprouts" on the ground:
On a hunch I guessed that I was seeing the top of the grass sprites and that they were underground for some reason. So I relogged and saw that I was right:
It seems like some positional error built up as I was running around maybe. I didn't notice if other decorations or items also dropped below the terrain and I haven't done as much running around since this happened. If I see this again I'll be sure to check other objects.