CD19 (WF19) introduces several failures in tests running the :migrate operation on legacy configuration files.
See standalone-full-ha-migrate.xml.original for configuration file which is subject of migration.
See standalone-full-ha-migrate.xml.migrated for configuration file after migration using 7.3.0 EAP.
Migration outcome with 7.4.0.CD19.CR1 (WF19)
Unfortunately I do not have a deeper knowledge of messaging subsystem to be able to tell what should be the best outcome of migration here.
Could be related to https://issues.redhat.com/browse/WFLY-10339 Broadcast/discovery-group resources have ambiguous requirement specs
Steps to reproduce