Depending on the position of the camera whole chunks of billboards will just disappear from the level. This is very distracting when driving. Am I hitting some sort of billboard / polygon count limit, or is there a setting for this that I missed?
If the greens are groundcovers, increase their shapeCullRadius from default 75 to something like 400. That fixed similar issue on my map. If it is forest, then maybe try Car_Killer's graphics mod with maximum LODs and see if that helps. https://www.beamng.com/threads/ck-graphics-settings-mod-v2-2-1b-for-beamng-0-29.87586/
