The issue is that the pieces_list is a list of dictionaries. Each dictionary contains the piece's name and length. The optimize_cuts function sorts this list based on the length in descending order. When there are multiple pieces with the same length, the order between them is not guaranteed. This can lead to some pieces not being allocated correctly.

The fix is to include a unique identifier for each piece. This will ensure that all pieces are accounted for.

After considering this, you are good to go, but if you need the implementation tell me in the comments so I add it to this message