I played through the Campaign Legendary CO-OP, Upon completing the 7th mission the game went to go onto the eighth which is just cinematic. When this happened the screen went black and I was pushed back into the menu. My CO-OP partner was still in game and finished normally. I got all the achievements that go along with beating the camping including the one for the 8TH mission. I initially thought it was just slow stat uptake because right after this my rank showed 6/8 completed. I played some War Games and then it became 7, it never got to 8. I went back into Campaign and looked at each mission in the list all of them had the Legendary emblem under CO-OP except 8, so I got my friend again and we started that mission, it went into the cinematic, we skipped it but when it ended I got a game menu message saying to play War Games now that I had completed campaign, also the Legendary Emblem now shows up under CO-OP for mission 8. Still I’m Legendary (In Progress) This is a very annoying bug especially because it has happened to me with almost every Halo in some way or another (Unrelated to Halo 4 but still!)
Any help would be greatly appreciated.

