Design failure? The Fender 5-strings that appeared in the late 90's/early 2000's were a failure, IMHO. Very floppy B strings and lots of weird dead spots.
In the words of bass guru Ed Cannacci (Gelb Music, Redwood City, CA), "The B strings on Fender 5-strings from the late 90's to 2001 or so, just didn't work."
In-line 5-string head stock is the giveaway:
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Exact opposite of my experience, specifically with 1997 MIA Jazz Deluxe fives. I used a .125 B and it sounded damn nice, got compliments with it frequently. I did play others with much heavier strings and disliked them. But the string wasn't the bass' fault.
IIRC Sharay Reed played one of these failures too. And loads of my friends.