GetSupportedGlobalNetworkCallingCodes returns empty dictionary

[AmirSasson]

PhoneNumberUtil phoneUtil = PhoneNumberUtil.GetInstance(); var all = phoneUtil.GetSupportedGlobalNetworkCallingCodes();
all will be an empty dictionary while it should return the full list of supported calling code metadata

[twcclegg]

It returns a Dictionary<>.KeyCollection which is a list of sorts, though it probably should be a proper List. As for the data itself, I'll look into it, in the meantime if you call GetMetadataForRegion first that will load the data and GetMetadataForRegion will return properly.

I came across this issue as well, there seems to be a problem with the isNonGeoRegion flag in LoadMetadataFromFile.
I can't work out what this method is trying to do when it populates countryCodeToNonGeographicalMetadataMap, but it doesn't seem to match the behaviour of the c++ version.