使用以下代码创建新插件：

class Facebook_Peeker {
    private static $facebook_bots = [
        \'facebookexternalhit/1.1 (+https://www.facebook.com/externalhit_uatext.php)\',
        \'facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)\'
    ];

    private $original_posts;

    public function make_scheduled_post_public() {
        add_filter( \'posts_results\', [ &$this, \'peek_into_private\' ], null, 2 );
    }

    public function peek_into_private( $posts, &$query ) {
        if ( sizeof( $posts ) != 1 ) {
            return $posts;
        }

        $status = get_post_status_object( get_post_status( $posts[0] ) );
        if ( $status->public ) {
            return $posts;
        }

        $this->original_posts = $posts;
        add_filter( \'the_posts\', [ &$this, \'override_private\' ], null, 2 );
    }

    public function override_private( $posts, &$query ) {
        remove_filter( \'the_posts\', [ &$this, \'peek_into_private\' ], null, 2 );
        return $this->original_posts;
    }

    private function is_facebook_seeking() {
        return in_array( $_SERVER[ \'HTTP_USER_AGENT\' ], self::$facebook_bots );
    }

    public static function init() {
        if ( ! self::is_facebook_seeking() ) {
            return;
        }

        $peeker = new Facebook_Peeker();
        $peeker->make_scheduled_post_public();
    }
}

add_action( \'plugins_loaded\', [ \'Facebook_Peeker\', \'init\' ] );

这允许Facebook机器人查看预定的帖子，但不允许其他公众查看。如果使用其他插件，请记住更新任何相关的缓存设置。

在以下帮助下得出的答案How to make scheduled post preview visible to anyone? 和How to recognize Facebook User-Agent.