I have been taking the time to test many of the games for the PSX core to see what works and what doesn’t. Is there a place specifically for this type of information? I have found alot of interesting bugs and would like to compile them in the most useful way possible for the developers.
You can file them on the issue tracker at the core’s github repo. There are big issues already for the OpenGL and Vulkan renderer. If the bugs occur on the software-rendered version, as well, and you can verify that they happen in mednafen standalone, you can try reporting it to the upstream mednafen team, but don’t mention anything about RetroArch or they’ll politely tell you to fuck off.