We recently identified a bug introduced during a code update that affected how linework was created when using our extended Offset functionality on XREFs. In some cases, objects generated from these offsets carried incorrect XData or linetype information, which could lead to unexpected behavior—such as the linework being flagged during an AUDIT or even removed.
The issue has been fully reviewed, corrected, and resolved in version v26.30. Updating to this version will prevent the problem from occurring going forward.