With some testing, it appears that the maria support works just fine,
they do a good job of pretending they are mysql. Even using a
"jdbc:mariadb" URL with org.mariadb.jdbc.Driver.
So the issue you are seeing is actually expected behavior.
Liquibase uses CURRENT_TIMESTAMP as a placeholder for "The
current timestamp function on this database" which on mariadb is
NOW() so it helpfully converts it for you.
Are you wanting to retain CURRENT_TIMESTAMP in your sql?
Nathan
Nathan