ValueType of property in backoffice create-wizard config ignored?

We recently noticed that the type we have for a property is ignored. We wanted to filter the list for the reference editor by inputing the subtype of the qualifier, but still got the whole thing. Looking into this a bit more, we found that the ConfigurableFlowRenderer class seems to simply ignore the given type by using its own resolveType method and overwriting the valueType.

Is this a bug or are we missing something?