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, 1995 Escort, 1970 Cougar, 2013 XT250, 2010 Vstar, 2014 CTX1300