Just tossing some information here on the forum to help get everything fixed.
In the Mission “Regret” the part right before you first get on a gondola there is a covenant dropship that is supposed to drop off two hunters. I have played the section multiple times, and every single time the dropship comes over then disappears completely, the hunters never drop and the game registers it as i’ve killed them and Miranda’s dialog starts.
Also, in the same level the hunters in the next section like to freeze in place, meaning no animation just frozen like statues.
Matchmaking has been functioning much better for me today, but mostly for Halo 2 Anniversary playlist, having a blast thanks 343!