mariabackup giving what appears to be a benign error regarding sst user rights during SST process.
 2020-08-26 23:25:00 Warning: missing required privilege REPLICATION CLIENT on .
/usr/bin/mariabackup based on MariaDB server 10.5.5-MariaDB Linux (x86_64)
I believe mariadb still expects that REPLICATION CLIENT exist in the grants table when its been updated to BINLOG MONITOR per the documentation. I don't believe mariabackup attempts to check the new grant type.
Everything is functioning normally. Trivial bug but is misleading.