It was damaged after the strike, so I would think it would still be classified as PMD even though its in a mint set. Its hard to tell what caused it, probably wreckless mint workers.
A mint error occurs in the minting process. Anything that happens after the coin is struck including packaging is post mint damage even if it happens while still at the mint. I agree this is just damage from the packaging machine.
In most years mint set coins really do not differ in any way from any other business strike coin. They are just handled and packaged differently. Weak strikes are prevalent in most years' mint sets. The big draw to mint sets are coins that have no bag marks - because they were never in bags.
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