The earliest recollection of this bug is traced back to PAN-OS 10.1.11-h1 - November 18, 2024.
This bug is fixed in PAN-OS versions 10.2.5, 10.1.11-h1, 11.0.3, 11.2.0.
Fixed an issue with email formatting where, when a scheduled email contained two or more attachments, only one attachment was visible.
For more information:
https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-release-notes/pan-os-10-1-11-known-and-addressed-issues/pan-os-10-1-11-h1-addressed-issues
https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-release-notes/pan-os-10-2-5-known-and-addressed-issues/pan-os-10-2-5-addressed-issues
https://docs.paloaltonetworks.com/pan-os/11-0/pan-os-release-notes/pan-os-11-0-3-known-and-addressed-issues/pan-os-11-0-3-addressed-issues
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-addressed-issues