I'm happy owner of one cotton luxury resouce giving happines bonus. I also have another cotton resource within same city area but it's plantation has been pillaged. However when I build a citadel on the cotton with pillaged plantation cotton disappears from list of luxuries and causes instant -4 happiness change. As far as I can tell I'm not trading cotton away.
I'm playing as Assyria and the city in question Carchemish was built next to an razed American city on the adjacent tile.
I'm playing as Assyria and the city in question Carchemish was built next to an razed American city on the adjacent tile.