The earliest recollection of this bug is traced back to PAN-OS 9.1.7 - July 29, 2024.
This bug is fixed in PAN-OS versions 9.1.7.
Fixed an issue where the firewall dropped GTPv2-x Create Session Response packets with the following error message: bad port 84b .
For more information:
https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-release-notes/pan-os-9-1-addressed-issues/pan-os-9-1-7-addressed-issues