It seems that the peace trade bug has gone, but now if you request something in a peace deal that the AI doesn't want to give you, then it's impossible to conclude the peace. Remove the blocking item and the AI still won't accept the deal, even though it is the one they proposed in the first place!
Also, there seems to be a new bug that you cannot transfer a governor to a city you recently captured; it just doesn't appear in the list. I don't know if this is endemic, I just encountered it once so far. It may be that the city list is capped - I have rather a lot.