The earliest recollection of this bug is traced back to PAN-OS 9.1.10 - July 29, 2024. This bug is fixed in PAN-OS versions 9.1.10. Fixed a rare issue where, when aggregate ethernet (AE) groups were deleted and re-added, the AE interface no longer had an SDB node to send link the location to. As a result, the dataplane was unable to identify a connected route for the interface address. For more information: https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-release-notes/pan-os-9-1-addressed-issues/pan-os-9-1-10-addressed-issues