I’ve built on the edge near the area in the first pic, took 3+ tries to get a camp spawned in at times. Course that was before the update, but trying in singleplayer in a out of bounds location always seems to work like it did last chapter (middle top right out of bounds, plenty of open land for testing). So I don’t think they changed how accurate their spawns are.

That location though was pretty picky with my build, added a new door and it gave me a pathing error message and no mater how much I tried activating it never worked like before till I reverted the change.