After downloading a 2.something mb update, my game doesn’t recognise my save games. On service record it shows all my stats, what missions I’ve done ans so forth but on load game it says no saves games found.
I was on the 4th mission on awakening the nightmare too 
Redirecting to this topic on the same issue:
https://www.halowaypoint.com/en-us/forums/f0258e8001734968984e8b56990f8daf/topics/game-saves-being-lost/ef2a10e9-8eda-4b0d-874b-f65a60922e22/posts?page=1#post18