Public Holiday is not displaying on the Calendar

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Hello Experts,

The Public Holiday that I defined for 2019 is showing up on the Calendar, but all the Public Holidays that I defined for 2020 is not showing up on the Calendar.

I have defined the new Public Holiday exactly the same way I defined the Public Holiday's for 2019.

Also the Public holidays are showing up in Dev instance but not displaying in Test instance.

Thanks in advance

SG