At least I can say that this generally doesn’t look like that (at least on PC).
Recently there was a Community Fly-In from Carcassonne and this old town looked correct (we flew circles around it, so from various distances and directions.
Here’s a screenshot I took back then, you can see the amphitheatre in the center that is magenta in the opening post:
Not sure what is going on in this case.
This is handcrafted scenery which is part of the downloaded world update package, so it shouldn’t be downloaded but present locally if you have the according world update installed.