main.mdl fails in buildbot with wrong result

main.mdl 'innodb'                        w2 [ fail ]

        Test ended at 2020-06-12 21:05:42

CURRENT_TEST: main.mdl

--- /usr/share/mysql-test/main/mdl.result	2020-06-12 18:18:50.000000000 +0000

+++ /dev/shm/var/2/log/mdl.reject	2020-06-12 21:05:41.868178883 +0000

@@ -81,6 +81,7 @@

 SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info;

 LOCK_MODE	LOCK_TYPE	TABLE_SCHEMA	TABLE_NAME

 MDL_BACKUP_FTWRL2	Backup lock		

+MDL_SHARED	Table metadata lock	test	t1

 MDL_SHARED_WRITE	Table metadata lock	test	t3

 unlock tables;

 connection locker;

mysqltest: Result length mismatch