I work at a bodyshop that does some dealer warranty work.
I have not seen this issue on a Quest, But we have done several Altima's and if I remember right a couple Rogues.
The issue is the chrome molding will flex and move slightly and rub the paint off the gate, and the rust begins.
The ones we repaired, the dealer sent us a new "improved" chrome molding that had a strip of foam rubber on it to prevent the paint rub issue.
We sanded off as much rust as possible, removed the rest of the rust with naval jelly, applied a self etch primer sealer and repainted.
I am assuming this is your problem, but like I said, we have not done a Quest.
My 2011 Quest has not had this issue, knock on wood!