Nice picture. With curious damage like that I would suggest changing valve stems even if your invoice says they were replaced. Unless those valve cores were defective from the factory, something caused it.
Always a good idea to carry a couple spare valve cores in your tire repair kit. And I also like metal valve caps with valve core remover tool ends so you never have to hunt for the valve core tool at night in the rain on a lonely back road.
Cheers,
John Downs
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