Found why: scanning-deployers-jboss-beans.xml has its list of
deployment names which will be silently skipped. Using a
jboss-scanning.xml is a good idea, but hardcoding this in, especially
for something like the root webapp, is wrong.
I think we should not be using such a hardcoded list, and should use
jboss-scanning.xml instead.
You're welcome to create them. ;-)