GTT: ERROR 1099: Table was locked with a READ lock and can't be updated on ALTER

CREATE TABLE t2 (c INT);

LOCK TABLES t2 WRITE;

CREATE OR REPLACE TEMPORARY TABLE t2 SELECT 0;

ALTER TABLE t2 FORCE;

12.2.0-dbg>ALTER TABLE t2 FORCE;

Query OK, 1 row affected (0.000 sec)               

Records: 1  Duplicates: 0  Warnings: 0

CREATE TABLE t2 (c INT);

LOCK TABLES t2 WRITE;

CREATE OR REPLACE GLOBAL TEMPORARY TABLE t2 SELECT 0;

ALTER TABLE t2 FORCE;

12.2.0-dbg>ALTER TABLE t2 FORCE;

ERROR 1099 (HY000): Table 't2' was locked with a READ lock and can't be updated