function pm_set_custom_permalink($post_id, $post, $update) {
    global $permalink_manager_uris;

    // Do not trigger when the post is updated
    // if($update) { return; }

    // Do not do anything if post is autosaved
    if(defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) { return $post_id; }

    // Ignore auto-drafts & removed posts
    if(in_array($post->post_status, array('auto-draft', 'trash'))) { return; }

    // Update only selected product post type permalinks
    if(empty($post->post_type) || $post->post_type !== 'product') { return; }

    if(!empty($permalink_manager_uris)) {
        $default_uri = Permalink_Manager_URI_Functions_Post::get_default_post_uri($post_id);

        if($default_uri) {
            $permalink_manager_uris[$post_id] = $default_uri;
            update_option('permalink-manager-uris', $permalink_manager_uris);
        }
    }
}
add_action('save_post', 'pm_set_custom_permalink', 100, 3);