Hello, I made those.
It's intentional but bear with me while I try and explain why I did that.
The backdrop and unit elements used to be individual layers and I would tell MAME to overlay them and scale them. That meant you could turn off the background and be left with the unit. But with some of the designs, I noticed the scaler didn't do a perfect job and rounded corners or diagonals would look a little messy, so I merged them and gave you a separate option for unit only. I also thought that would be easier to use.
So I think all of the Gold Series and New Wide Screen (those shapes anyway) still have that option because they seemed unaffected and I think nearly everything else was merged to give a little better quality. Get them from my links if you want the latest ones.
MAME Artwork / Artwork Previews
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