European Union

For anyone that wants a work around, you can do the following:

Update functions.php in your child theme:

/**
 * Add a new country to countries list
 */
add_filter( 'woocommerce_countries',  'add_eu_to_dropdown' );
function add_eu_to_dropdown( $countries ) {
    $new_countries = array('EU'  => __( 'European Union', 'woocommerce' ),
	                    );

	return array_merge( $countries, $new_countries );
}

Then edit this plugin with the following:

	/*
	* Save the product meta settings for simple product 
	*
	* @since 1.0.0
	* @para $post_id
	*/
	public function save_custom_product_fields( $post_id ) {
		$restriction = isset($_POST['_fz_country_restriction_type']) ? sanitize_text_field($_POST['_fz_country_restriction_type']) : '';
		if (! is_array($restriction)) {

			if ( !isset( $_POST['_restricted_countries'] ) || empty( $_POST['_restricted_countries'] ) ) {
				update_post_meta( $post_id, '_fz_country_restriction_type', 'all' );
			} else {
				if ( !empty( $restriction ) ) {
					update_post_meta( $post_id, '_fz_country_restriction_type', $restriction );
				}
			}
			
			$countries = array();
			
			if (isset($_POST['_restricted_countries'])) {
				$countries = isset($_POST['_restricted_countries']) ? wc_clean( $_POST['_restricted_countries'] ) : '';
			}

			$eu_countries = array( 'AT', 'BE', 'BG', 'CY', 'CZ', 'DE', 'DK', 'EE', 'ES', 'FI', 'FR', 'GR', 'HU', 'HR', 'IE', 'IT', 'LT', 'LU', 'LV', 'MT', 'NL', 'PL', 'PT', 'RO', 'SE', 'SI', 'SK' ); 
			
			if ( ! empty( $countries ) && is_array( $countries ) && in_array( 'EU', $countries )) {
					$countries = array_merge($countries, $eu_countries);
			} else {
					$countries;
			}
			
			update_post_meta( $post_id, '_restricted_countries', $countries );
		}
	}
	
	/*
	* Save the product meta settings for variation product 
	*
	* @since 1.0.0
	* @para $post_id
	*/
	public function save_custom_variation_fields( $post_id ) {
		$restriction = isset($_POST['_fz_country_restriction_type'][ $post_id ]) ? sanitize_text_field($_POST['_fz_country_restriction_type'][ $post_id ]) : '';
		
		if ( !isset( $_POST['_restricted_countries'] ) || empty( $_POST['_restricted_countries'] ) ) {
			update_post_meta( $post_id, '_fz_country_restriction_type', 'all' );
		} else {
			if ( !empty( $restriction ) ) {
				update_post_meta( $post_id, '_fz_country_restriction_type', $restriction );
			}
		}

		$countries = array();
		if (isset($_POST['_restricted_countries'])) {
			$countries = isset( $_POST['_restricted_countries'][ $post_id ] ) ? wc_clean( $_POST['_restricted_countries'][ $post_id ] ) : '';
		}

		$eu_countries = array( 'AT', 'BE', 'BG', 'CY', 'CZ', 'DE', 'DK', 'EE', 'ES', 'FI', 'FR', 'GR', 'HU', 'HR', 'IE', 'IT', 'LT', 'LU', 'LV', 'MT', 'NL', 'PL', 'PT', 'RO', 'SE', 'SI', 'SK' ); 
			
		if ( ! empty( $countries ) && is_array( $countries ) && in_array( 'EU', $countries )) {
				$countries = array_merge($countries, $eu_countries);
		} else {
				$countries;
		}

		update_post_meta( $post_id, '_restricted_countries', $countries );
	}

Basically, we want to change how the 2 functions “save_custom_product_fields” and “save_custom_variation_fields” save the data. Note that on next update this will need to be updated again until this or similar feature is implemented by Zorem.