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As project-gc uses the information from geocaching.com / Groundspeak via api, you please have to tell them via help center function. https://www.geocaching.com/help/index.php
But it could be a long time until this will be changed.
The county/region information in PGC is collected from OpenStreetMap project and updated manually from time to time as described in the FAQ. It is indeed good to know about this change, but until it will be fixed in OSM, there is nothing PGC can do.