I can get around the problem as I have on many others already. I use a product called 'Solv-A-Set' by Walthers ( many train shops carry this ) . I cut the decal along the shut lines, and apply the Solv-A-Set ( behaves like water ) to the decal shut line area . As it dries, it pulls the decal into the shut line. The Minichamps Porsche, has me concerned....the decal 'film' appears to be a 'peel and stick' vinyl piece - judging by thickness( see the white field on the RH door where the picture is looking 'down' )..........which tells me that it will not react well to Solv-A-Set, or at least it hasn't on the examples I've tried. I can guess why Minichamps have gone this route, but find it unacceptable to me.
If anyone has any experience contrary to mine, please let me know.