Issues when setting up playlists for more obscure systems

So, I've been trying to set up some more obscure systems for my RetroAchievement shenanigans and I ran into an issue when setting up Mega Duck. Now, admittedly, this is nitpicky, but RetroArch can't seem to recognize Mega Duck as a system name when I'm trying to manually scan the directory to create a new playlist for any and all Mega Duck games. What is causing this? I ran updates with the online updater and it didn't fix the issue from the looks of things. I know I could just set the custom system name for the playlist as Mega Duck, but come on.

The playlists look better when they have a unique icon for system.