CDI Decorator for a JAX-RS annotated interface results in WELD-001306

I already bugged the Errai and Resteasy guys with my problem, but I was told that you guys are in charge of this

I possibly discovered a bug in the Weld implementation provided with JBoss 7.1.1.Final.
I was playing around with Errai and JAX-RS and I discovered that when I add the JAX-RS annotations to the interface this works as expected.
As soon as I start to use a CDI Decorator with the JAX-RS interface, i start getting the following error:

"org.jboss.weld.exceptions.UnproxyableResolutionException: WELD-001306 Attempting to inject an unproxyable normal scoped bean Decorator….."

If I then put the JAX-RS annotations back at the implementation, everything works fine. Unfortunately this behavior is not working for me, because Errai needs the annotations at the interface to create client code.

As I was unsure if this only happened with Errai on the classpath, I created a very little demo project, which exactly shows the bug I mentioned: https://github.com/w0mbat/RESTTest