Thank you Marko, you are correct. We resolved this by removing wildcard types from custom bean implementations: This is probably not a 100% complete solution, but in combination with your enhancement WELD-1488, it should make things much easier to detect if something goes wrong.

https://github.com/forge/furnace-cdi/blob/master/impl/src/main/java/org/jboss/forge/furnace/container/cdi/impl/ContainerServiceExtension.java#L199

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