I can't really say much, I was just going through campaign on master of strategy difficulty. I've had an issue like this in AM#09 mission, during a cutscene before the mission, however I don't think it should affect this case in any way. And I've seen that it's already taken care of. Just for being sure, here's a picture: AM#09 HG on too light vehicle during a starting cutscene I don't really thint there's anything else I can really say to help, hope it's enough.