On both the Tapani and Thomas partial black missing the missing area is completely inside the area missing from the NNOF sheet cards.
I really believe this points at a piece of opaque tape being in the plate exposing machine. When it was removed, a few remnants were still on the glass and messed up a second plate.
I suspect on the next black plate made.
It doesn't surprise me that the guy who missed a big piece of tape would miss remnants when he tore that big piece of tape off the glass.
The plate maker at the place I worked would have caught hell for letting either of those go to the pressroom.
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