There were at least 4 ‘centerline' bunkers in the original design of the 14 par 4s/5s.
I have an oblique aerial (quite nice; probably within 1 year of opening) looking from above Augusta CC towards Washington Pike.
The original centerline hazard on the 14th was massive. It was a very long hazard down the right centerline of the 14th fairway. If the fairway was 50 yards wide, this hazard is 100 yards long. The photo wasn't published in either the Frank Christian book or Stan Byrdy's book but is displayed somewhere in the clubhouse.
Photo also shows centerline bunker in the 2nd fairway, and the bunker on the 8th was much more in the center than today.
With the centerline hazard on 11th, it seems like a centerline hazard was quite in favor with Jones and Mackenzie at the time.