As of today:
Noticed the following errors:
1. Something strange is happening in the cave with the owlbear. If the mother calls for a helper in the form of a male (legendary action), the child remains hostile after killing them and cannot be recruited in the future.
2. The corpses of Mairina's brothers. Sometimes both are lying, but sometimes, either both or one of them periodically do not appear in the swamp. What it depends on, I couldn't figure out.