Reporting a bug where when using manual selection for city states (20 on a map with 20 civs) I found that repeatedly one of the city states would replace a full civ. What seems to happen is that the CS's leader overrides the full civ's leader - in this case, Japan is replaced by the generic CS leader for Buenos Aires.

The replaced 'civs' will usually found a single city with no name and do nothing for the entire game.

Logs and screenshots: https://www.dropbox.com/s/3wglsz4jh16s14l/CS%20bug%20lua.rar?dl=0

I tested a game earlier with 6 civs and 9 CS on the same map and the issue didn't occur. It seems to only happen when using a large number of civs and CS.