I had the dealer fix the problem with the SA322 update, but this seemed to make it worse. To confirm it was the bumpers I placed a piece of thin cardboard I found over the lower rubber. Amazing stop immediately. Drove around for a couple of weeks No noise. Then I had another idea. Maybe it is the plastic and the rubber shifting (gripping and Release) causing the noise. I removed the cardboard idea, and lubricated the contact points on the lower rubber with a few drops of push bike chain lube, and to my amazement no noise. No noise since.
My thoughts on Kia's fix is if they jam it up harder by packing, the noise go's away. But as the rubber over time wears and flattens the noise comes back, let alone the wear and forces on the latch.