incluse cpt

add_action( 'pre_get_posts', 'include_cpt' );
function include_cpt( $query ) {
  global $wp_query;
if ( is_page( array( 'ricerca-sport-e-corsi-mare', 'ricerca-sport-e-corsi-terra', 'ricerca-altri-sport' ) ) ) {
if ( $query->is_tax() && $query->is_main_query()  ) {
$query->set( 'post_type', array('corsi'));
}
return $query;
}
}