The earliest recollection of this bug is traced back to PAN-OS 8.1.2 - January 09, 2024. This bug is fixed in PAN-OS versions 8.1.2. Fixed an issue where an Aggregate Ethernet (AE) interface with Link Aggregation Control Protocol (LACP) enabled on the firewall went down after a cisco-nexus primary virtual port channel (vPC) switch LACP peer rebooted and came back up. For more information: https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-2-addressed-issues