I'm stumped then too we could just get the man himself to verify where we're going wrong.. I don't know if krzys-h is a user here tho? Maybe @LibretroRetroArc can help us out? Are you using the Cores from the buildbot?
Yes, I am using the ones specifically made for UWP, I haven't tested any windows core yet. I also asked krzys-h directly on youtube as well
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Do you think we should ask in the GitHub conversation: https://github.com/libretro/RetroArch/pull/7834