Comments - Troubleshooting Connection Issues
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You could edit /etc/mysql/debian-start to not run the function "upgrade_system_tables_if_necessary" (or edit the packages mysql.service unit file in /etc/systemd/system/ to not run the script by removing the line "ExecStartPost=/etc/mysql/debian-start" but this will stop two other checks from running as well...)
It means on upgrading the Mysql service to a newer version you may need to manually run an upgrade command to get functions etc working again. Not sure what else it may impact but I assume thats it. Its like this in the upstream mariaDB supplied .deb package
Annoying that it looks like an error on every start of the database but I think I will just leave it how it is