vdogamez
Chieftain
I had a whole bunch of sparsely spaced cities with little gaps in between them in my territory. So a neighboring civilization, who I had open borders with, decided that one of those gaps was the perfect spot for a city. He brought in a bunch of workers to improve, and an archer to garrison in the city. A few turns later, I finished researching nuclear fission, and noticed that I unfortunately had no uranium. Except that right next to the other civilization's buried city was a whopping three hexes of it. Luckily, I was on great terms with the other guy, so he happily sold me his city for one of my nine ivory resources and some silk. I went into the city to set its production, and noticed a wonder that I had missed a few eras back that required me to have a city right next to a mountain to even build, something I didn't do when I placed cities. I started production, but noticed that the amount of turns would take the city forever, so I sent over a great engineer I found to hurry production. But when I tried to send him into the city, it wouldn't let me! Apparently, the archers previously garrisoned there didn't feel like moving, and just sat there in the middle of MY city, and I couldn't go in. What's worse, my open borders didn't end for another fifty terms. When it finally did end, the archer was forced out of my territory, and my city was accessible again. This was a rather frustrating bug, but a rather specific one, so I'm not sure how easy it would be to recreate.