I don't know if this was from the factory or dealer-added, but my Jetta has some relatively thick, clear 1/4" wide door edge guard applied at the door edges. I'm guessing it might be dealer added. they had added (allegedly) $3000 worth of garbage to the car; but then didn't try to charge anything extra for it. not sure why not.
2019 Cherokee, 2018 Jetta, 2014 Sentra, 2001 Camry, 1995 Escort, 1970 Cougar, 2013 XT250, 2010 Vstar, 2014 CTX1300