An error indicating that some items failed, but the operation succeeded overall.
Mac Catalyst 13.0+
Examine the specific item failures, and act on the items that failed. Each specific item error will also be from the CloudKit error domain. You can inspect the userInfoCKPartialErrorsByItemIDKey to see per-item errors.
Note that in a custom zone, all items in an operation are handled atomically. As a result, you may get a CKErrorBatchRequestFailed error for all other items in an operation that didn't hit an error.