It's turn 313. I sell Hiawatha his city back for all of his GPT and all of his luxury resources. I check the UI, it all says the duration of the deal is 50 turns. Turn 314, I get the notification that the trade deal with Hiawatha has ended. I check, I no longer have any of his luxuries or his GPT. He hasn't declared war on me. There is no vassalage situation because I have vassalage disabled. Neither of us are sanctioned by the WC, and there is not a WC vote for another 8 turns (and sanctioning either of us is not something on the table). ...what am I missing? Thanks for your help!