The earliest recollection of this bug is traced back to PAN-OS 8.1.14 - January 08, 2024. This bug is fixed in PAN-OS versions 8.1.14. Fixed an issue on Panorama where the ACC tab did not show data for the period before the daylight saving time (DST) change. For more information: https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-14-addressed-issues