It seems that apache snaphots
https://repository.jboss.org/nexus/content/repositories/apache-snapshots/
is included in the public group
https://repository.jboss.org/nexus/content/groups/public/
Is this intentional?
This is giving problems for some builds.
Yes, this is intentional (http://http://community.jboss.org/wiki/MavenRepository).
If you want only jboss artifacts (i.e. no proxy repositories) you should use the "public-jboss" group.
http://repository.jboss.org/nexus/content/groups/public-jboss/