Should a refinished rim have paint/powdercoat on the mounting face?

Factual Questions
#1

Just unboxed a commercially refinished car wheel. There is paint on every surface, including the surface that gets mounted to the car’s hub. Every other wheel I’ve seen has bare metal on the mounting face. Presumably this is not only for precise alignment, but also to assure proper static friction when the lug nuts pull it up tight.

Am I wrong about that? Is it acceptable/safe for a car rim to have paint on the mounting face?

#2

My guess would be, no, it’s not safe. Paint makes an extremely poor washer/spacer. The paint will chip off and the lug nuts will no longer be tight. Sand it off or call the refinisher and have them do the job right. IMHO, of course.