24 years ago I bought a new 1995 Am Standard Jazz. Had the worst dead spot I ever encountered on "C" of the G-string, but I didn't notice it until I had the bass a few days. I took the bass back to the store where I bought it. The salesman said he would talk to the Fender Rep. The Rep agreed to replace it.
I received another 1995 Jazz. The dead spot on it wasn't quite as bad, but it was on "B" of the G-string. I didn't even take this one out of the store. The salesman said he couldn't promise anything, but he would talk to Fender again. The Fender Rep said he would get a 1996 if I could wait a couple weeks, which I did.
When the 1996 arrived, I was told it had graphite bars in the neck on both sides of the truss rod, a thicker headstock, and a slightly thicker neck overall. It was much, much better. It still had a minor dead spot near C sharp of the G-string.
The salesman told me I had the curse & I would find a dead spot on every bass or guitar I played from that day forward, and he was right.
Here's the thing; every solid object on earth has a resonant frequency. If you can produce the resonant frequency of an object (with enough energy), the object will vibrate at that frequency. When a string vibrates at the resonant frequency of a bass, the body / neck also vibrate and absorb the energy of the string. There are basses (short scales, aluminum or graphite necks, headless, etc) that have a resonant frequency which is somewhere above or below the frequency range of a standard tuned bass. Those are the ones that have almost no noticeable dead spot.
If you get the curse, you can find dead spots while wearing headphones playing loud music, because you can feel the body vibrate when you hit the specific note. It really is a curse....