hide free shipping if shipping class is in cart

gistfile1.txt

/**
 * @snippet       Disable free shipping option if a specific shipping class is added to cart
 * @author        Fabio Tielen // Code Agency // https://codeagency.be
 * @testedwith    WooCommerce 3.2+
 */
 
add_filter( 'woocommerce_package_rates', 'ca_hide_free_shipping_for_shipping_class', 10, 2 );
  
function ca_hide_free_shipping_for_shipping_class( $rates, $package ) {
$shipping_class_target = XXX; // search for shipping class ID in your settings
$in_cart = false;
foreach( WC()->cart->cart_contents as $key => $values ) {
 if( $values[ 'data' ]->get_shipping_class_id() == $shipping_class_target ) {
  $in_cart = true;
  break;
 } 
}
if( $in_cart ) {
 unset( $rates['free_shipping:YYY'] ); // search for the shipping method ID in your settings, 
}
return $rates;
}