Thank you very much. This is it. It is missing from this page: https://civilization.fandom.com/wiki/Tile_improvement_(Civ6)
However it has an own page if you know its name.
https://civilization.fandom.com/wiki/Seastead_(Civ6)
At King.At what difficulty level does the AI start to get bonuses the player doesn't get?
I'm guessing that Geneva was at war with you (as a result of your war with their then-suzerain), but their suzerain changed and they automatically made peace (hence, what sounds like a peace treaty that needs to cool down before you can DOW them separately). How closely were you monitoring notifications? A CS peace notice can easily be overlooked amidst the flurry of other war-related notifications.