The earliest recollection of this bug is traced back to PAN-OS 8.1.6 - January 09, 2024.
This bug is fixed in PAN-OS versions 8.1.6.
Fixed an issue on PA-3200 Series and PA-5200 Series firewalls in an HA active/active configuration where the SNMP notification did not report the HA interfaces.
For more information:
https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-6-addressed-issues