main.ipv6, main.ipv4_and_ipv6 failed in buildbot with wrong result

main.ipv4_and_ipv6                       w1 [ fail ]

        Test ended at 2019-10-31 18:11:56

CURRENT_TEST: main.ipv4_and_ipv6

--- D:/winx64-debug/build/src/mysql-test/main/ipv4_and_ipv6.result	2019-10-31 17:56:34.116096200 +0000

+++ D:\winx64-debug\build\src\mysql-test\main\ipv4_and_ipv6.reject	2019-10-31 18:11:55.976214400 +0000

@@ -1,5 +1,4 @@

 =============Test of '::1' ========================================

-mysqld is alive

 CREATE USER testuser@'::1' identified by '1234';

 GRANT ALL ON test.* TO testuser@'::1';

 SHOW GRANTS FOR testuser@'::1';

mysqltest: Result length mismatch