i'm pretty sure that's a beamng issue, i remembering it happening in other maps too like wcusa and italy
I cant do anything about it, maybe someone will kindly update the bus missions someday, because they are unrealistic/outdated and buggy.
Very good map as i remember, but after this update i only get 10-15fps but about a 6-9months ago i dont remember after which update i just cant play it
I get even lower, but I've noticed that if I look away from the car - the fps is totally fine! And in my case it started lagging after 0.30 update. I tried deleting some objects from the map until I've realised it's the vehicle that's causing fps drops, and when I tried different cars - some of them fix the issue and some of them drop it insanely, but keep in mind that on other maps all cars perform identically.
After updating the game to the latest version (0.37), there are again gaps in the textures on the map. A fix will be provided as soon as possible; please do not report this as a bug.