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Using partial classes with 2018.3.4f1. THIS is the only thing that helped within this thread (in my case).
It seems like the issue was that menu camera also had CameraFollower on it (with a null reference because I didn't need the following there). That...
I don't want to waste anyone's time so:
Got a MatchDirector empty gameObject with my class in it,
CameraSystem is a Camera...