而且日志中的 key 确实无法 decode：
(root@127.0.0.1) [(none)]>select tidb_decode_key("6D426F6F7473747261FF704B657900000000FB0000000000000073");
+---------------------------------------------------------------------------+
| tidb_decode_key("6D426F6F7473747261FF704B657900000000FB0000000000000073") |
+---------------------------------------------------------------------------+
| 6D426F6F7473747261FF704B657900000000FB0000000000000073 |
+---------------------------------------------------------------------------+
1 row in set, 1 warning (0.00 sec)
(root@127.0.0.1) [(none)]>show warnings;
+---------+------+---------------------------------------------------------------------+
| Level | Code | Message |
+---------+------+---------------------------------------------------------------------+
| Warning | 1105 | invalid key: 6D426F6F7473747261FF704B657900000000FB0000000000000073 |
+---------+------+---------------------------------------------------------------------+
1 row in set (0.00 sec)