I remove the is_admin() tag from the if & still got no reaction.
+ as test I put this in the functions.php file:
function my_taxonomy_query( $args, $field, $post_id ) {
// modify args
$args['orderby'] = 'count';
$args['order'] = 'ASC';
echo '<pre>';
print_r( $args );
echo '</pre>';
exit;
// return
return $args;
}
add_filter('acf/fields/taxonomy/query', 'my_taxonomy_query');
Is it possible the ajax call is never done because its a frontend form?