The paint is rubbing off of my Apple Vision Pro battery

I use my AVP every day at work. I normally set the battery on my desk. It is a regular cubical table style desk. There is nothing special about the desk or its surface.

You can see in the following image mostly in the upper left and lower right corners the paint is rubbing off of the AVP battery. Is this considered normal wear and tear or is there something wrong with the paint on my AVP battery?