The following happened which has essentially ruined the game for me.
Fighting with province passing back and forth likely resulting in low provincial morale.
Province revolted to neighbor whith whom I was at peace.
Revolted province was heavily garrisoned by me (more than 25 units)
I'm now at war with the owner of the revolted province without either of us attacking; this seems to have been automatic because my garrison was automatically treated as an enemy
Next turn revolted province returns to me because neighbor who now owned it had no units in the province
End result: I and neighbor are now in a war that neither of us wanted
Is this result intended?