I recently send a lens to Nikon authorized service. It went in stopping solidly at infinity, and came back with infinity at about 15 feet on the scale. I called to complain, and the service rep explained that some of the modern AF cameras won't give focus confirmation at infinity unless you go PAST infinity, first, so they are setting them slightly off to allow that. When I explained that I was on film, not digital, and often relied on the focus scale, he had the lens put back the way it had been sent to them. For a subsequent lens CLA I was certain to specify infinity at infinity.
I also remember when the first complex zooms and lenses with exotic elements came out in the 70s or 80s they were set to go past infinity to allow for temperature changes. I believe the 180/2.8ED Nikkor may have been the first lens I read about that did this.