North Frisian language code is "frr" for fy_DE "fry" code is used which belongs to "Sater Frisian" also data map to "Sater Frisian" so "Sater Frisian and North Frisian Locale" renamed to "Sater Frisian" https://sourceware.org/ml/libc-alpha/2017-07/msg01009.html
I think now we can make this also invald
INVALID.