Can't do favor quest while favor bonus is active

[DeletedUser8950]

System won't let me do a favor quest challenge ('Breaking from the past') while there is a favor bonus active on my city. See screenshot below. There is another favor quest in process ('A Ruler's Celebration') but IMHO that shouldn't affect the quest challenge I want to do now.

World: Baris
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[DeletedUser]

Its got nothing to do with the favor increase. You have already accepted a quest that decreased your defense value so you cannot take another defense decrease, you have to wait till the first one is over and then you can accept the quest.

Just like you cannot stack the same boost to defense, attack or Unit rewards you also cannot stack negative effects.