This is going to be very vague so bare with me.
The part of the mission ( I forget the name ) where you have to go to the Drug Camp on Drug Road to kill the Tech Officer, he is not spawning and there is no objective marker. So you cant complete the mission after that point.
I’ve had it happen to me three times now. Is the Predator killing him ahead of time and screwing the mission up? Is that a thing?