I found out a workaround that removes the flickering and the black pixel on the right side. Increase the scale of your video footage to 100,5 and the export will be perfect. It’s an Adobe/Apple bug, the software cannot understand 4k (4096) footage, pixels are either not counted properly or some other size or scale related issue. Ridiculous… I am considering switching to Davinci Resolve for cutting as well, after many years of Premiere Pro. The downside of Premiere began when they removed Speedgrade. In my humble opinion Adobe will disappear in 10 years from now and will be irrelevant in 5.