I have a spy in an enemy city performing a heist mission. However, I can sue the enemy for peace and ask for the city that my spy is operating in. When this happens, my spy returns to my own capital, but he continues to try to accomplish his mission. I will get a notification saying he completed the heist mission in my own capital or that my spy who is counterspying in my capital caught and killed him or whatever the result of the mission is.
The bug is reproducible simply by suing Russia for peace and asking for Tula, then advancing to the next turn. The spy may not die, but you will see the notification of him completing the heist mission within my own capital. During my current game, I got unlucky and my spy counterspying ended up killing my own spy when he fled back to my capital and, apparently, continued trying to finish his mission.
The bug is reproducible simply by suing Russia for peace and asking for Tula, then advancing to the next turn. The spy may not die, but you will see the notification of him completing the heist mission within my own capital. During my current game, I got unlucky and my spy counterspying ended up killing my own spy when he fled back to my capital and, apparently, continued trying to finish his mission.