In the print game.....seen a lot over my 25+years. Been involved in offset, digital, screen printing etc etc
There are other factors that come into play....
The factory ideally needs to be warm and have a correct constant temperature when printing.
Certain inks need to go down on a primer. Most places skip using/printing the primer as it is expensive.
The clear coat should not be applied straight away. One needs to run a test in a ink lab to ensure the print inks and the varnish is compatible.
Inks release chemicals. A lot of newer vegetable/soy inks are designed to break down. Using UV or latex based inks is a whole different ball game again.
One needs to check and understand the correct purpose off the end product to make sure correct ink is picked and used.