When 2x unstable shapeshifter ( on opponent's side) copied my Azure Dragon to create 2 "fresh" copies. I used Unsummon on one of the shapeshifters it unsummoned all 3x copies the 2x Shapeshifters, and my Azure Dragon.
This seems like a distinct bug as the text for Shapeshifter states: "fresh" copy, this statement contradicts the actions laid out above.