Sprinter Interior paint Surface stickyness

Just starting my build on a 2023 Sprinter. I was told by a supplier (Second Skin Spectrum) that Mercedes started putting a waxy coating over the interior paint, that has to be scuffed up with light sandpaper to provide adhesion. It may be related to items Z74 and Z75 (body shell additional measures) on the build sheet. Anybody know about this?