Comments - Maxscale filter error question
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MaxScale 2.2 and 2.3 are no longer supported as they've gone EOL. You could upgrade to a newer version of MaxScale to see if the problem is fixed there. If it isn't, once you've tested that the problem remains on a supported version (21.06 is GPLv2 and supported), you could open a bug report on the MariaDB Jira under the MaxScale project.