I went back in time (restored a save) and I now have another save file with the problematic animal shed (the "old one") which you can use to reproduce the bug with the steps I provided. Its the save slot: Slot_00000015.save/Slot_00000015.save.ver0
Save file:
https://drive.google.com/file/d/1ub0sa9rtOWpUVYjTlEQXhYTNYnqCfvaX/view?usp=drive_link
it's the Olde Mill Hill lot, you can't add cows because the shed loses ownership after household rotation, but if you add one, even with DEBUG interactions, it'll be stuck in the lot, with no owner, and if you sell the shed, it'll be stuck in your family inventory forever.
