Root Cause: The keyword "EPIPHANY", for the UC_HOLIDAYS.PL calendar, was missing so the 'Epiphany' or 'Holy 3 Kings' holiday did not show up as a holiday when using US_HOLIDAYS.PL which is for Polish holidays.
Update to a fix version listed below or a newer version if available.
Fix Status: Released
Component(s): Automation Engine and Initialdata
Automation Engine 12.1.0 - Available
Automation Engine 12.0.2 – Available
Automation Engine 11.2.4 - Available
Add this entry to the calendar as a static keyword.