A user that had REPLICATION SLAVE, REPLICATION CLIENT privileges before upgrade to 10.5, has REPLICATION SLAVE, BINLOG MONITOR after upgrade, but is not able to run SHOW SLAVE STATUS anymore, as it is missing the new REPLICATION SLAVE ADMIN privilege now which is necessary for this in 10.5.
IMHO mysql_upgrade should take care of replacing REPLICATION CLIENT with BINLOG MONITOR, REPLICATION SLAVE ADMIN when doing a pre-10.5 to 10.5 or later upgrade.
Same for REPLICATION SLAVE, that should become REPLICATION SLAVE, REPLICATION MASTER ADMIN, REPLICATION SLAVE ADMIN instead on upgrades to 10.5., so that existing users can still continue to use SHOW SLAVE HOSTS and SHOW RELAYLOG EVENTS.
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