Mark unread, how oh how to use it?

Hmm new and unread are different things.

It is getting a bit confusing for me too – if you think there’s a bug or a UX issue somewhere, perhaps you can try laying out some steps (step 1, do this, step 2, do that) to reproduce what you think is odd. This way our team can try and walk through the same experience and determine if this is intended.