I was recently at the TÜV (MOT) in Germany with my 2021 Plus Four, mine has the 2 additional brake lights, I had neither discussions nor problems.
The inspector was pleased with the vehicle, he doesn't see that very often.
No technical problems, emissions test ok, next check in 2 years.
I think there are differences depending on the country and the inspector.
In Germany you do not have to show or carry the COC either.
