PC Engine CD cores

Can someone confirm if “mednafen pce fast” and “mednafen supergrafx” cores aren’t working properly?

When loading the BIOS both cores work, but when loading an ISO or CUE file it loads but just goes to a black screen. I have tried more than 5 games with the same result.

BTW normal non-CD games works perfectly on both cores, but any CD games I’ve tried has resulted in a black screen.