Ok, the "fixed" version is ready. I say it in quotes because there is one miserable spot where the terrain bug just didn't go away at all, even after remaking. It's on the frontal edges of the empty "orange-house" lot. The business building no longer has a bistro in it, and the apartment building I made still sucks, but oh well...
Let's look at the good things! I upgraded the visual of the cosignment store area, removed the trash spawners, moved the cowplant statue, removed lots of community parking spots to reduce the "massive carpool spawns" lag, the workers from the business building kept their original jobs this time, not even a second has passed in the game (it was 8:04 before, now it's back to 8:00), 2 or 3 previously removed houses stayed this time, and there are gender doors on old community lots with bathrooms now, and for that I think that this town is now better than before.