The following message can be seen upon trying to repair or check a database for errors:
PLESK_WARN: The storage engine for the table doesn't support check
This is an expected behavior. The message indicates that MySQL/MariaDB check/repair table only supports specific types of tables. If the check/repair table command is performed on an InnoDB table, this message will appear.
The warning message can be safely ignored. Check the following link for more details: MySQL documentation: mysqlcheck