By coincidence just been speaking to my dealer having had my cylinder returned from replating. He said they use the contractor they do because they do a good job including chamfering the ports so the piston doesn't catch when there's wear.
Might be worth checking? Although the piston is new if the cylinder is worn just perhaps it wobbled enough to catch?
It's hard to put the rings on wrong because of the locating pin it should be obvious which way is up. However ... you can put the piston in wrong. There should be an arrow on the crown pointing forward. Although I would've thought getting that wrong would result in instant failure. The piston must be oriented so the ends of the rings cannot flick out into the ports.
Apart from that maybe it was a "normal" seizure - too lean, too cold, no oil etc etc
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