https://github.com/apache/geronimo-config/blob/trunk/impl/src/main/java/org/apache/geronimo/config/cdi/ConfigExtension.java#L161

We register a custom bean of type provider, and mark it correctly as an alternative. Based on this, our custom bean should be registered as the bean in use rather than the default InstanceImpl that ships with Weld. However, we still get Weld's InstanceImpl.