[1.12][BUG] AI can found a city on a dragon cave
After I converted a wildland area, one of my opponents (Yithril) sent in a pioneer to found a city. When I looked closer, it turned out that it occupied exactly that spot where a dragon cave had been before. How is that possible since there was no grain/materials/essence marker on that tile?
When I conquered that city, the tile obviously contained two things. One mouseclick selected the city, the next selected the dragon cave and so on. It turned out later when I had researched the necessary technology that I could not build a storm dragon camp on this spot (although I could press the button). Only "raze" worked.
Here is a screenshot: https://www.dropbox.com/s/mn66l1z9y04qjl0/2012-12-31_00001.jpg.