When you configure EJB3 subsystem so that remote invocations should be executed in thread pools of EJB3 subsystem instead of IO worker threads:

/subsystem=ejb3/service=remote:write-attribute(name=execute-in-worker,value=false)

This seems to have no effect and invocations are still executed in IO worker threads.

This is a regression, in EAP 7.0 it works correctly.