I wasn't purposefully looking for a bug, I just stumbled into this one on Amerish. I forgot the location's name, but it's probably in my screenshot. I just normally spawned at a sundy and ended up under the map. NGL, I thought it was funny to shoot people from under there, so I got a few kills. Obviously, they got really mad. I stopped eventually. Here's the screenshot: Look, although I couldn't resist messing around with this for a few minutes, I don't normally do this. Pls, no ban.
So if the devs just added logic to the spawn that could compare the z-coordinate of the player to the z-coordinate of the collision model of the terrain, a fix could be born.