The earliest recollection of this bug is traced back to PAN-OS 11.2.0 - March 13, 2025. The firewall using the Advanced Routing Engine has inconsistent formatting of multicast output from the CLI command: show ip igmp sources json . For more information: https://docs.paloaltonetworks.com/pan-os/11-2/pan-os-release-notes/pan-os-11-2-0-known-and-addressed-issues/pan-os-11-2-0-known-issues