CAMPAIGN IS BROKEN! Fix this with priority please!

I’m playing the campaign and every time I get killed on local split screen co-op, it fails to loads the last checkpoint and makes me go back to main menu.

Also, on some sections in chapter 1 eg silo rocket, nothing happens and the game has basically frozen for the next triggered section.

I’ve preordered and after so long of making this you have released a broken game. What will you do to make it up to people? Some in game credits post fix should cover it.