Description: My vasal AI besieged or attacked a barbarian city, where the battlefield happened to include one of my cities. This resulted in the battle getting stuck until the end of the game with my city being blocked. The city was unable to finish any building even buying anything was not possible, as everything was being shown as taking forever to be build. Strangely the queue could be switched around, but to no avail. One further problem is that the battle was between AI and a barbarian, so I could not include my armies to resolve the battle and my city was useless the whole game.

Attachments: I cannot see how to attach the screenshots so I would add them as images

Steps to Reproduce: 1. Have a vassal  // 2.The Vassal should attack a barbarian city close to your city

Expected Behavior: Neutral/AI battle should not include player cities in the battlefield