Strange error on CREATE OR REPLACE .. SELECT under lock

MariaDB [test]> create table t1 (i int);

Query OK, 0 rows affected (0.68 sec)

MariaDB [test]> lock table t1 write;

Query OK, 0 rows affected (0.00 sec)

MariaDB [test]> create or replace table t1 as select * from t1;

ERROR 1100 (HY000): Table 't1' was not locked with LOCK TABLES

drop table if exists t1;

create table t1 (i int);

lock table t1 write;

create or replace table t1 as select * from t1;

revision-id: monty@askmonty.org-20140202093802-a6jtuy6ni29biigz

revno: 3968

branch-nick: mariadb-monty