Are you maybe using the google play version ? Google play versions haven’t been updated for many years.
No. I am using the latest Retroarch version downloaded from this website and i’m using the latest MAME(current) core.
In any case, it seems that there is some problem with Namco System 22 on this core that is not present in MAME4droid 2024.
I have tried games like Ridge Racer or Cybercycles, and all have graphic artifacts not present on MAME4droid 2024.
MAME has 3D software rendering so I suspect it is a compilation problem on Android, but 'm not sure. That’s why i’m asking. Namco System 22 is an very known arcade system that no one has noticed the same thing. :?