Minor bug? Used the racoon that trades an item for "same type, increased rarity". Gave him the roof structure and he returned a whetstone accessory. Maybe there is not Rare structure? Or do structures count as accessories?
balloon is a rare structure, but I think you confused the something else with the raccoon, there is an event that trades an item with another one of the same rarity, and maybe you confused these two idk if the raccoon event even exists bc I've never seen it
