Speaking of bug reports, if the window is too small (in my case, windowed on a 1920x1080 monitor) the settlement list and army list can overlap the lower-left panel. More seriously, on 50x50 maps, zoomed-out tiles can glitch. Yes, I have a mod here (which simply adds a new map), but I've seen both of these in entirely vanilla gameplay .
EDIT: I should also add that a town view of a town in a desert still uses the same exact tileset as a grasslands settlement, even if there's no sign of grass being anywhere nearby.