You're stating in the v4.2.4 changelog that the issue I've reported here https://stackideas.com/forums/the-eu-vat-app-label-on-checkout-misses-the-vat-rate
has been resolved but that's not true.
I am very disappointed. Are you guys even test your code?
The EU-VAT label now says: EU-VAT Tax added ( %s )
The %s variable doesn't get replaced because you're not using the JText::sprintf() method.
Moreover, even if you use the sprintf() method the label will be EU-VAT Tax added ( 24 ) which is wrong as it misses the percentage % sign. It should become: EU-VAT Tax added (24%).
More time wasted.