Could be a stain . they look peeled like it would look like if you peeled a chunk of paint off a wall its hard to tell from my crappy camera
Stain and plating issues with the zinc is my bet possibly a chemical reaction to whatever it was on them to make it worse than normal bubbling. Not a lamination error
What you see on the surfaces of both coins occurred after they were in circulation. They're not copper plating bubbles - but some chemical or liquid was on the surface of the coins, giving the 'effect' you see.