Now this seems like a minor bug, but its actually pretty gamebreaking, whoever is in the third slot whether AI or player controlled will immediately start gaining relations and vision with independants anywhere on the map, this also includes independants in the new world when they start spawning. This means that whoever is in the third slot will get massive vision/trade advantage along with easy new world colonisation, I have seen the player/AI in 3rd slot gain top fame pretty quickly without fail every game.