SO many quests have had either invalid quest timers as the timer says still many seasons to complete before expiration or the quest shows wrong time to complete the quest. One example is the Hearalds quest: Kingdom for a chicken in which I had still 5 seasons time to complete but it still expired everytime even though I would load a save.

I do have custom 6 days season change which I don't know if effects but still its only x2 the default days so it would not make sense still.

BTW I like the system of being able to change season after day 3 even though I would have higher custom season days. PLZ let it be I don't know is this considered a bug but I think it good this way! The default 3 days is way too short in my opinion.