Note all the affected areas are towards the rim. It was like the edge of those devices broke off because of die aging. They happen a lot, but they are continued to be used for a larger die event happens before it is retired.
Call me infatuated about it but I end up keeping almost 90% of my change for months or more before I am comfortable about spending it. I tend to ask about the value of my coins but I have never tried to sell any of them. I don't know why I just enjoy looking at them. I have even made my own little die crack-chip progression collection.