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The plugin doesn’t do things how it should be done for C++ projects, I am using Blueprint Callbacks and delegates and the async blueprint nodes are used differently. You should take a look at Exi’s tutorial in the forums for C++ version of sessions hosting.
That being said there isn’t much of a downside to keeping it a blueprint interface.
Thanks for the answer, tho it’s not the one I was counting for. 
Can you point me to the location where your node is implemented then? I really don’t want to mix blueprints and C++ in that place.
Thanks for the hint about Exi’s compedium, didn’t know about its existance.
Edit:
Okay, I’ve found the guilty class. It seems like UK2Node_LatentOnlineCall is responsible for creating such wrapping nodes for all children of UOnlineBlueprintCallProxyBase.