DROP TABLE on Mroonga table with vector key fails with ER_NO_SUCH_TABLE

MariaDB [test]> create or replace table t (v vector(1) not null, vector(v)) engine=Mroonga;

Query OK, 0 rows affected (0.135 sec)

MariaDB [test]> drop table t;

ERROR 1146 (42S02): Table 'test.t#i#00' doesn't exist