In mysqldump galera SST method, if nodes are started with log-bin and log-
slave-updates, the GTID on the joiner shoots as the dump for all databases
in donor is replayed on the joiner node.
As a result of which - after the SST completes and the joiner in synced - the
donor and joiner nodes end up in different binlog states and hence same
transactions may get different GTIDs.
The GTIDs on both the nodes should be consistent after the SST.