main.plugin_auth_qa_2 failed in buildbot with wrong result

main.plugin_auth_qa_2                    w4 [ fail ]

        Test ended at 2019-07-10 00:50:31

CURRENT_TEST: main.plugin_auth_qa_2

--- D:/winx64-debug/build/src/mysql-test/main/plugin_auth_qa_2.result	2019-07-10 00:07:59.608499200 +0000

+++ D:\winx64-debug\build\src\mysql-test\main\plugin_auth_qa_2.reject	2019-07-10 00:50:31.021471600 +0000

@@ -59,8 +59,6 @@

 GRANT ALL PRIVILEGES ON test_user_db.* TO qa_test_3_dest identified by 'dest_passwd';

 GRANT PROXY ON qa_test_3_dest TO qa_test_3_user;

 exec MYSQL -h localhost -P MASTER_MYPORT -u qa_test_3_user --password=qa_test_3_dest test_user_db -e "SELECT current_user(),user(),@@local.proxy_user,@@local.external_user;" 2>&1

-current_user()	user()	@@local.proxy_user	@@local.external_user

-qa_test_3_dest@%	qa_test_3_user@localhost	'qa_test_3_user'@'%'	qa_test_3_dest

 DROP USER qa_test_3_user;

 DROP USER qa_test_3_dest;

 === Assign too low values for *length, which should have no effect ====

mysqltest: Result length mismatch