All I can say at the moment is that we're aware that there is an issue for some people, in some cases, and that we are doing our best to find out what the issue is.
Unfortunately, we have so far been unable to find a reliable way to encounter the issue, which makes both debugging, and verifying any bugfixes on the matter, rather difficult.
I have a fix for the issue, its called adding a non cloud base, no achievement earning iron man mode. I don't play iron man mode for the chieves, i play it so i cant save scum or use console. Mount and blade and crusader kings 2 have an anti save scumming save option that is local, why not this game?