I believe that is the space created by the design of the folding windshield. You can see that other side of that crack on the inside of the A-pillar with the door open. I read another thread where the owner sealed the door frame crack with similar good results.
I’ve been trying to eliminate wind noise for 1.5 yrs and stumbled on cure. I ran the cable shown in first pic and wind noise got worse. I sealed the area per pics and case solved.
Wow, good find, mine has been driving me crazy since I had it. I pulled the windshield down and stuffed foam and weather strip seals into all cavities, added more all along the windshield body side frame area, and little change. I didnt take the cowl panels off, will go there next.