Well at least it should. They were saved out from PS and as I said before this do not happen in Cycles and RS for instance.
Of course I provided a very simple material setup, but it might become very complex specially with packaging labels.
In your example we can clearly see a dark edge overlaying the red color. So we conclude the stacking order is not an argument.
Also to reinforce this theory is not relevant I masked only dielectrics materials, same issue again.
Anyway, I appreciate your efforts.