Visual bugs for edges
Guess screenshot will suffice, seems to only affect water / ice transitions:

Did I ever mention I hate rounding? -.- I'll see what I can do. Would you be able to produce a small map for testing which I could just load and instantly see the issue?
Fun fact: I can't really create a map as I have problems reproducing this issue. But you can (hopefully) do the following:
- Resolution 1920x1080 (if that matters)
- use the map Kalte Zeiten (Karte06-fix)
- place a Building at 14:58
- hit the "jump to" button
Without jumping to a building I was not able to reproduce the issue. Jumping to some building resolved the issue, jumping to some others caused the issue.

@ Flamefire, I was quite lucky - while testing something for fisheries, I created a map where the edge is bugged right after starting the game. Guess thats a good testmap for you then :)
@Flamefire may we fix this one as well for 0.9.0? :x
I'll see what I can do