Yes, this is a known issues which we are trying to solve. More info can be found here: https://forum.paradoxplaza.com/forum/index.php?threads/combat-not-ending-stuck-in-map.1042220/
This is a known issue, we're really sorry for ruining the immersion. It's super hard to reproduce in our development environment (happens once every 200h or so), so we've been having a hard time fixing it. We are trying our best though. Maybe we stike gold and get it fixed for the next big patch.