this is revealed by additional unit tests in https://github.com/ValeevGroup/tiledarray/commit/1ed7567ea8f074551425453db014d43d0de55f0a . <img width="1158" alt="Image" src="https://github.com/user-attachments/assets/aea4caf9-6cf8-4fed-bf98-319e2e99f451" /> this is fixed in https://github.com/ValeevGroup/tiledarray/pull/512
