The Config_DisplayConfig_GpsCoordinateFormat export doesn't exist in the protobufs package. The correct export is Config_DisplayConfig_DeprecatedGpsCoordinateFormat, which matches what's used in the validation schema.
Added TODO comment explaining that this field is deprecated since protobufs 2.7.4 and should be migrated to DeviceUIConfig.gps_format when DeviceUI settings are implemented.