CONTAP-715654: Bug public information is not yet available.
Issue
Veeam Backup & Replication against ONTAP S3 object stores with versioning-enabled buckets. During repository rescans, Veeam calls ListObjectVersions with Delimiter and MaxKeys parameters. ONTAP incorrectly returns the last CommonPrefix entry from one page as the first entry on the next page, resulting in duplicate entries. Veeam interprets this as a data structure error and throws "An item with the same key has already been added," leading to inconsistent repository scans and unreliable backup operations.
