The earliest recollection of this bug is traced back to PAN-OS 10.1.9 - February 19, 2025. This bug is fixed in PAN-OS versions 10.1.9. Fixed an issue where DNS exception failed when DNS queries contained a capital letter. For more information: https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-release-notes/pan-os-10-1-9-known-and-addressed-issues/pan-os-10-1-9-addressed-issues