钩wp_insert_post_data 筛选以强制将帖子状态设置为未完成，然后才能将其设置为已发布。使用以下代码，只能保存设置为未完成的帖子：

add_filter( \'wp_insert_post_data\', \'prevent_post_change\', 20, 2 );

function prevent_post_change( $data, $postarr ) {
    if ( ! isset($postarr[\'ID\']) || ! $postarr[\'ID\'] ) return $data;
    if ( $postarr[\'post_type\'] !== \'product\' ) return $data; // only for products
    $old = get_post($postarr[\'ID\']); // the post before update
    if (
        $old->post_status !== \'incomplete\' &&
        $old->post_status !== \'trash\' && // without this post restoring from trash fail
        $data[\'post_status\'] === \'publish\' 
    ) {
        // set post to incomplete before being published
        $data[\'post_status\'] = \'incomplete\';
    }
    return $data;
}