Injection into bean in portable extension not working.

I have a portable extension with the following 2 beans defined:

public class BeanA() {
@Inject
private BeanB beanB
...
}

public class BeanB() {}

Both beans are created by the portable extension and added (via addBean)
in the afterBeanDiscovery method. When I deploy a war I get
"WELD-001408 Unsatisfied dependencies" for the private field beanB. The
portable extension is on the system classpath and not part of the war.