MDEV-24197, all mtr tests for Galera failed during SST because mariabackup fails with the following diagnostic:
There new option added by
MDEV-24197 is the only argumentin the list (in "innobackupex.cc") that starts with "--innodb" prefix. As a result, get_opt treats any argument starting with "--innodb-" as shorthand for "--innodb-force-recovery".
And we get a non-zero xtrabackup_innodb_force_recovery value due to the parser's erroneous interpretation of some other argument (some other option with the "--innodb-" prefix) supposedly as "--innodb-force-recovery".
In particular, this has to do with the bootstrap process when starting mtr - it's from /mysql-test/t/bootstrap_innodb.test: