Apologies for the silly title, but the issue is a real one, even though it is not a new thing. Schema upgrades are not an ordinary operation in Galera. For the subject at hand, the bottom line is: under the default Total Order Isolation (TOI) method, “the cluster replicates the schema change query as a [&]

https://www.percona.com/blog/2021/04/23/yearly-reminder-ddls-that-fail-to-propagate-may-cause-percona-xtradb-cluster-inconsistencies/