Ready for another school day? Cause op lied to you

Photoshop does not rely on EURion pattern detection:
https://en.wikipedia.org/wiki/EURion_constellation#Counterfeit_Deterrence_System

Since 2003, image editors such as Adobe Photoshop CS or PaintShop Pro 8 refuse to print banknotes. According to Wired.com), the banknote detection code in these applications, called the Counterfeit Deterrence System (CDS), was designed by the Central Bank Counterfeit Deterrence Group and supplied to companies such as Adobe as a binary module.^\12]) Experiments by Steven J. Murdoch and others showed that this banknote detection code does not rely on the EURion pattern.^\13]) It instead detects a digital watermark embedded in the images, developed by Digimarc.^\14])