My 2024 is exactly the same. Was like that before I installed my BAKFlip MX4 tonneau. Haven’t done anything about it yet, but will the next time at the dealership. Definitely not normal.
My Audi A4 had a code for the knock sensor, which is a real pain to get to. I replaced a leaking temperature sensor and the knock sensor code went away. The moral of the story is proper diagnosis and not just throwing parts is vital. Dealers (if they have good techs) have the equipment to live...
Krown rustproofing is very popular in Canada and very well regarded. It is not an asphalt type coating but rather an oil type spray that is reapplied annually.