I had created a thread for my issue until I noticed this. So I will post my issue here as well in the case that my thread is cleaned:
Hey there,
There seems to be a huge issue with the game currently, specifically that if you lose connection to Xbox Live at any point during a Legendary campaign run, you will not get the commendation for the campaign mission you were in. This has been reported many times I'm sure, as well as I have had friends who have encountered it. Unfortunately, it has also negatively affected me.
I am not great at Halo, but I had managed to scrap and claw my way through part of the Legendary campaign so far. Unfortunately, because I play with my notifications turned off, I did not receive the "You have lost connection to Xbox Live", and as so I had completed two stages(Forerunner and Infinity), through much effort and perseverance only to realize after the fact that those completions had not been recorded.
I would very much appreciate a correction on my profile that I have completed these stages, as well as hopefully a fix for this issue the next time there is a patch pushed live, so that it affects as few gamers as possible.
Thanks.