I got a quest for collecting Sardines in Summer, which shouldn't be possible as fishing quests pull from the list of catchable fish for that season. I'm playing single-player on Windows through Steam, and it is a modded game, but I don't know if this is related to a mod. See below for screenshot, with the sardine quest and summer in the top-right corner. I checked the wiki and also confirmed that sardines are not available in summer (it's actually the only season they're not available).
View attachment 21117
I'll just ignore the quest, so it's not a huge crisis, but I'm not sure if this is a bug and if so, where else it might be.