main missions repeating on the same location

[JoSchaap]

(revive beta branch) grabbed from git an hour ago

I've just experienced 3 main missions spawning on the same spot after each other

1. enemy outpost, after clearing it i could barely get out there with the ammoboxes before a heli spawned on top of the outpost for the next mission.
2. (attack chopper). just as i cleared that mission another
3. enemy outpost spawned on top again..

needless to say, things got a bit messy