I'm not sure how to specify this; but on inheriting a kingdom (Lotharingia), my character instantaneously lost all of the counties and duchies they already controlled (Flanders & Valois, which were mostly outside the borders of the newly-inherited kingdom). There was no text visible to explain that this was being done. I'm assuming this is a gameplay bug rather than an intended but underdocumented game mechanic?
I'm not sure how to specify this; but on inheriting a kingdom (Lotharingia), my character instantaneously lost all of the counties and duchies they already controlled (Flanders & Valois, which were mostly outside the borders of the newly-inherited kingdom). There was no text visible to explain that this was being done. I'm assuming this is a gameplay bug rather than an intended but underdocumented game mechanic?