I found an issue in the code "magic-images.nut"
As Boxxman said, that isn't a bug, it was intentionally using tags to find region. You could use name to save time from manually tagging, but matching might not be accurate for all types of roms ( U, US, USA, W, WORLD, EUR, EUROPE, etc..) - same for ESRB, you will need to add tags (ESRB-E, ESRB-M, etc) as there is no info on that being scraped