Something similar happened to me once. Then I walked around the house and found a blade somwhere like 50m avay from house. So I have taken it and come back to sell it again.
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I have version 0.0.72 and I found a bug how to make extra money for free, by accident. When you place some polearm grip into doors, or somwhere into a place where customer is taking his stuff with him, somethime happens that blade from sword will also jump into that polearm grip. This means customer will pay you, but the blade will remain with you(on polearm grip, so you may need to reset the game), then you can sell it again without buying a new material and make more than 110% revenue instead of 10%.