This is upstream issue for https://bugzilla.redhat.com/show_bug.cgi?id=1431406, related to HornetQ. It is suspected the same problem exists in Artemis.

Description of HornetQ bug:

HornetQ JMS bridge does not remove vendor specific properties from message headers when handing over (forwarding) messages to a thirdparty JMS broker.

This occurs on a JMS bridge that has been configured from a HornetQ cluster to a thirdparty JMS broker. The HornetQ assigns "_HQ_ROUTE_TOsf.my-cluster" header property to messages for routing within the cluster. However that header property does not get removed from messages by the JMS bridge.