mine was flickering like that as well, only on the passenger side.Heres the blinking LEDs on braking issue:
https://youtube.com/shorts/h-WmfogRMkI?feature=share
you'll have an issue after coding like this where only one of the reverse lights light up, and you'll have a soft fault (which you would have regardless of whether you used long coding or the Apps functionality).
follow the steps in this thread to resolve both issues.
https://www.golfmk7.com/forums/inde...-led-tails-with-dap-harness-for-mk7-r.370593/