MCC campaign Cross-over games won't start!!!

So I waited for my xbox one to finish downloading the season 6 update for MCC, when it finally finished (took 3.5 hours) I went to continue with my campaign, the master chief saga, went through all the options and started the game but then got booted back to the main screen!? Anyone else have this issue and is there a fix for it or has 343 messed this whole thing up??

Hey OP, I’m afraid that - like with most previous updates - mid-mission check points are lost during large updates, I don’t believe there is a way to get this back. It was announced ahead of time a few times