It wouldn’t be considered a “bug” because there is no malfunction and, there might be a use for this behavior that I’m not aware of. I suppose it could be considered an area for improvement though. 
Regardless… I haven’t used any of the templates included with Cubase in a long time. And, any that I may have used have long since been revised to fit my needs and are now saved as my own templates. So I don’t know if they still do what I describe to the audio or not. I just wanted to mention this possible behavior to you as an awareness thing.
I’m sure that many CB users at some point will create a template from one of their own projects. And, if you don’t go through a convoluted procedure like I mentioned above, you will end up with a template that saves audio to one huge shared pool. Not good. This is why I continue to submit this feature request when each new version of CB is released…
Regards 