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I do not know how it does it but I have scratched a blade with a kydex sheath. Nothing more than kydex dust inside. I would not figure soft plastic would be able to do it but it did. I have had it happen on a Swamp Rat and Bravo-1. Not bad scratches but ones you can see. Not had any from the sheath after it was cleaned up good. Those were when I first tried sheath making,leaned to make sure the sheath was completely clean before removing the tape after that. Is it possible that there are some hard media in the kydex that comes out in the dust?
Wait a minute,just thought of something. While sanding the kydex particles of the sandpaper are going to mix with the kydex dust making it abrasive.