MDEV-13569 has already been closed, but the failure is still observed in buildbot:
wsrep_info.plugin 'innodb' w1 [ fail ] Found warnings/errors in server log file!
Test ended at 2020-04-08 06:37:30
2020-04-08 6:37:23 140397153060544 [Warning] WSREP: no nodes coming from prim view, prim not possible
^ Found warnings in /dev/shm/var/1/log/mysqld.2.err
wsrep_info.plugin failed in buildbot with "no nodes coming from prim view"