Strange, it was to be fixed. But don't need to worry, this bug happens only on the quest journal, the quest is already completed. You can continue the story normaly. I'll look further on this. You can keep going on the story normally, just talk to the blacksmith.
Thx for the comment.
Alright. One more thing, I've been playing and I think I got all the upgrades for the village? I've expanded it and got the hospital, fishing house, and all the rest too.
Besides that blue pearl quest, I don't have any other quests, did I reach the current end already? (The only thing I haven't done is reach the final floors of the dungeon, I'm at floor 4)