Comments - Upgrade of MariaDB, how to recover the database schema's in the data directory?
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The database's aren't directly transportable and its best to treat the entire datadir as a single entity.
My recommendation would be to take a mariadb-dump of your Joomla 4 database. Stop the MariaDB-11.2 instance, replace the datadir with your original databases, start the MariaDB-11.2 service, and import the Jooma 4 backup.
Note at the moment 11.2 is an Alpha release. Unless running on the very bleeding edge is something your willing to do as testing, I recommend moving back to 11.0 or 10.11 before restarting the MariaDB service in the previous instructions.