(Not really important) When in the mission editor I was looking through the terrain types to see them all, until I found out when you click on desertflat, and switch back to any other terrain type, it still is flat, but yet its the other terrains (grass, snow, and hills, even back to the original desert)
#Terrain bug
frail yew
I already found a fix to my problem, if you just click test level, then stop "exit test" itll fix it