So this problem has come up again. Now the country is Slovakia.
It is no longer officially called Slovakia, as it is now Slovak Republic.
I use VAT Moss extensively along with the API. So when I create and set a contact’s country to either Czechia or Slovak Republic, we’re ultimately getting API errors because the contact’s country is silently set to United Kingdom and so VAT Moss invoices break.
This problem, along with all the others I’ve reported and have long-since been ignored, is real