Halo 4 Shutdown Legendary (solo) bug?

I went and beat Halo 4 Shutdown on Legendary twice on two separate occasions. Still marked unplayed. H4 mission Reclaimer also bugged. So much for “flight testing” the game to make sure it works before it launches…

Oh, and Spartan Ops episode cutscenes audio and visuals do not line up.

That happened to me too the first time, that was about 2 years ago. I completed the game, but Shutdown was marked unplayed. I just went back to it, redone it, and that unlocked the achievements for both completing the mission and all achievements related to the difficulties.