tidb_decode_key解析不了key?

Create Table: CREATE TABLE `log_user_type` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `app_id` varchar(255) NOT NULL DEFAULT '',
  `uid` varchar(255) NOT NULL DEFAULT '',
  `uuid` varchar(255) DEFAULT NULL,
  `old_username` varchar(255) DEFAULT NULL,
  `old_user_type` varchar(255) DEFAULT NULL,
  `old_device` varchar(255) DEFAULT NULL,
  `new_username` varchar(255) DEFAULT NULL,
  `new_user_type` varchar(255) DEFAULT NULL,
  `ip` varchar(255) DEFAULT NULL,
  `user_agent` json DEFAULT NULL,
  `created_at` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`) /*T![clustered_index] CLUSTERED */,
  KEY `idx_uid` (`uid`),
  KEY `idx_ip` (`ip`),
  KEY `idx_created_at` (`created_at`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin AUTO_INCREMENT=90001