The earliest recollection of this bug is traced back to PAN-OS 8.1.8 - January 09, 2024. This bug is fixed in PAN-OS versions 8.1.8. Fixed an issue where host traffic ICMP packets larger than 9,180 bytes dropped when you configured a jumbo frame with a maximum MTU value of 9,216 bytes and with the DF option enabled. For more information: https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-8-addressed-issues