We have no idea who made that map or how conscientious they are. We're not big on copying Google either.

Note that west of this point, the road is mapped, but marked as highway=proposed, e.g.  https://www.openstreetmap.org/way/1326493079/history 

Based on the changeset comments, it is quite possible that construction is being concentrated on the Adare Bypass, so as to have it ready for the golf.