QLocale method nativeCountryName returns wrong values.

There is a problem with some country codes and the related native names.

when using: 

QLocale(QLocale::AnyLanguage, QLocale::codeToTerritory(QString("US")));
QLocale(QLocale::AnyLanguage, QLocale::codeToTerritory(QString("GB")));

the country stored in the QLocale object is correctly set to UnitedStates and UnitedKingdom but when I am trying to get nativeCountryName() it prints me something like that:

for US: "ᏌᏊ ᎢᏳᎾᎵᏍᏔᏅ ᏍᎦᏚᎩ"
for GB: "Rywvaneth Unys"

When I changed the country code from US to USA and GB to GBR, then USA works correctly, but GBR is recognized as QLocale::UnitedStates instead QLocale::UnitedKingdom.