You can't lock a Connect Table.
MariaDB [test]> lock table federatedconnect read;
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ERROR 1015 (HY000): Can't lock file (errno: 122 "Internal (unspecified) error in handler")
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MariaDB [test]> lock table federate_classic read;
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Query OK, 0 rows affected (0.00 sec)
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It should work like with federated SE.
Additional while working with mysqldump (MDEV-4877) having no LOCK support will break any dump requiring a LOCK.
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Bug
Major