This bug was captured on stream.
To replicate, order a handcraft of a large amount of spoilable items, and have the spoil timer of the product run out before the craft completes.
The products will begin stacking into the same slot as spoiled craft results, instantly turning into spoilage.
Link to clip of the bug:
https://www.youtube.com/clip/UgkxFLUnx5 ... kZJ4ty20WL