This applies to the real humankind as well, but rn I'm venting about the game
My 3rd play-through, each time I had to just give up because bugs just pile up. Can't make peace, can't make war, this last time the game told me my civilization had fallen when an AI captured the last city of another AI...
And here I thought I ran into some shit in the endgame. I just got the thing where districts and forests stopped rendering once I had the map permanently visible. I also got a lot of popups that "you are close to a war loss: low war support" about my allies, like the game doesn't differentiate between being allied to someone and at war there for some reason.