So, I have noticed a bug over the past few weeks where if your male character dies while their wife is pregnant. Then the child born after your death will be of her bloodline and the marriage will show as being matrilenial, though before it was a regular marriage. This has happened twice in my current game. Images below.
Save File is also attached. We are the Hucbaldi dynasty in Romagna. This bug occurred with our current character's brother and father. It's an ironman save.
Save File is also attached. We are the Hucbaldi dynasty in Romagna. This bug occurred with our current character's brother and father. It's an ironman save.