Change url to posts if they have custom tax only

It works for me.

add_filter('post_link', 'locale_permalink', 10, 3);
add_filter('post_type_link', 'locale_permalink', 10, 3);

function locale_permalink($permalink, $post_id, $leavename) {
    if (strpos($permalink, '%category_slider%') === FALSE) return $permalink;

$post = get_post($post_id);
if (!$post) return $permalink;
    if ($post->post_type != 'post') {
        return $permalink;
    } else {
        $terms = wp_get_object_terms($post->ID, 'category_slider');
        if (!is_wp_error($terms) && !empty($terms) && is_object($terms[0])) $taxonomy_slug = $terms[0]->slug;
        else $taxonomy_slug = 'news';
        return str_replace('%category_slider%', $taxonomy_slug, $permalink);
    }
}

add_filter('rewrite_rules_array','remove_bare_folder_rule');
function remove_bare_folder_rule( $rules )
{
    unset($rules['([^/]+)/?$']);
    return $rules;
}