The earliest recollection of this bug is traced back to PAN-OS 8.1.18 - January 08, 2024.
This bug is fixed in PAN-OS versions 9.1.4, 8.1.18.
A fix was made to address a vulnerability regarding information exposure through log files in PAN-OS that made it possible for configuration secrets for HTTP, email, and SNMP trap v3 log forwarding server profiles to be logged to the logrcvr.log system log ( CVE-2021-3032 ).
For more information:
https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-18-addressed-issues
https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-release-notes/pan-os-9-1-addressed-issues/pan-os-9-1-4-addressed-issues