The shift interrupt switch - cutout switch - only opens when you shift out of gear with the propeller in water. It may twitch a bit when you're shifting out of gear on muffs, but it's unnoticeable.
The slight delay will be much more noticed (hopefully) in the water under load. If your tack's RPMs don't drop for an instant and climb back, you have bad switch OR linkage is worn and not within needed specs. Trust me!