For what it's worth:
I've had the "fifth bow rubbing" issue since day 1 of my 2017 touring roadster. I did have the dealer replace the bungees within the first couple of months, and it "fixed" the problem for like 3 times of opening the top. Then the top starting hitting the tonneau cover again. I have tried the adjustments described in the manual, but the problem persists. I finally gave up, and just live with the extra noise and clunkiness.
As you'll see from searching this forum, it's a very, very common problem, and most dealerships have so little experience with the roadster that they really lack the skills to work on the top mechanism.
I hope your dealer is correct in claiming that Nissan engineers are designing a fix, but I wouldn't hold my breath. The earlier "fix" of new bungees certainly hasn't helped, in my experience.
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