Two issues, one major, one just annoying. Both of these I have tested with and without mods, and with a clean install of the game.
The annoying one: if you stray off of a grass field with a mower, or go out of the field a bit with a mulcher and hit the decor grass, it disappears the next day instead of growing back.
The major one: The traffic light system uses invisible walls to stop traffic, this is neat in theory, except that it also stops you. No big deal either right? Just obey the signals. Except if you have a semi, because you swing for corners, and the opposing light catches you. It's basically impossible (by level of annoyance) to navigate any of the traffic lighted areas with a semi truck.
Otherwise, really enjoying it. It's an excellent map. As some others have said some of the audio queues from previous farms are still there. That's odd, but not the end of the world.