I think Panama and Suez (maybe call it 'Port Said') should just be hardcoded to be built automatically as cities if they aren't already built by their respective dates. It's simple; it's easy; it doesn't require the AI to understand intricate fort-building; and it solves all controversy and debate.What the point of adding Panama and Suez Canals as wonders anyway? Especially considering tying to specific tiles. You just can found a city in those places, and you get your canals. If something, it should be added as tile improvement, which can be build by workers for some big amount of turns after some late tech, and only need for this is because both Panama and Suez are bad city placements.