A similar thing happened to…
A similar thing happened to me when I purchased a vehicle that was shipped over from a dealership to the dealership I normally use. The finish was all scratched up and I think it was from how the other dealership must have run their vehicles through an automatic car wash that used hard bristle brushes versus washing them by hand to keep them clean while they are sitting on the lot.
Your dealer likely used a filler wax that washed off and then the scratches were visible again.