GTT in-use guard is bypassed by DROP DATABASE statement

CREATE GLOBAL TEMPORARY TABLE gtt (id INT) ON COMMIT PRESERVE ROWS;

INSERT INTO gtt VALUES (1);

--ERROR ER_TABLE_IN_USE 

DROP TABLE gtt; -- ER_TABLE_IN_USE (4256)

DROP DATABASE test; -- SUCCEEDS (bypasses the guard)

13.0.0-opt>CREATE GLOBAL TEMPORARY TABLE gtt (id INT) ON COMMIT PRESERVE ROWS;

Query OK, 0 rows affected (0.014 sec)

13.0.0-opt>INSERT INTO gtt VALUES (1);

Query OK, 1 row affected (0.001 sec)

13.0.0-opt>DROP TABLE gtt;

ERROR 4256 (HY000): Table `test`.`gtt` is in use.

13.0.0-opt>DROP DATABASE test;

Query OK, 1 row affected (0.014 sec)

13.0.0-opt>