3.2 changed the way that choice based types load choices. They now use choice_loader instead of choices. This caused all type extensions which used to override choices to break, because the choice loader takes priority.

As a simple fix we can add 'choice_loader' => null, as default to our extensions.

Effected types are:

• CountryType
• CurrencyType
• LanguageType
• LocaleType
• TimezoneType

Since not many of us write extensions for these types, and providing BC for this might be hard, I'm leaving this note for others to save some debug time :)