I would like to see it become a requirement to complete a lap before and a lap after ( no pauses) in order to achieve a special jersey. I often see a rider stopped along the side just before the sprint or KOM prior to an attempt at the time. I think it adds to the achievement if you have to put in some sort of ride prior to gaining the jersey.
I typically stop and take a break every 10 miles or so. Stopping at 10 miles from the start point of a ride (not jumping in near someone) stops you just before the Green Jersey sprint begins, so that might be what you are seeing.
Thanks for the info. Don’t mind when someone stops or takes a break. Just thinking about ways to keep things honest.