Question about a two-node MariaDB Galera Cluster
I'd say highly unlikely. During the network partition, when switch was pulled, (on an equally weighted quorum calculation) quorum cannot be achieved and the two node cluster loses primary component status. Exactly the reason not to have an equally weighted two node setup. When there's no prim component, there's no DML. After the situation is fixed the nodes find each other to form prim component and continue synchronous replication.

Highly unlikely that they get out of sync this way.