Websphere 8.0.x javaassist proxy does not reflect instance value

I have a strange issue in the ViewConfigResolverProducer where the ViewConfigResolver is always null. When I debug what's happening I can see that the underlying ViewConfigExtension creates a ViewConfigResolver and stores it in an instance variable which is later is returned through getViewConfigResolver. However, the returned value is always null. I've tested this in the Liberty profile where it works so it seems to be isolated to Websphere 8.0.x line. Have you seen anything like this before?

Regards,
Hampus