If I use

bean-discovery-mode="annotated" 

in beans.xml the @ClientWindowScoped are not detected. With mode "all" it works fine.

https://jakarta.ee/specifications/cdi/4.0/jakarta-cdi-spec-4.0.html#default_bean_discovery

describes that "all other normal scope types," have to be detected. I think ClientWindowScoped is a normal scope since 4.0.