Sorted out: Some paths are wrong in \hari\refs\RGB-A.slangp (I checked only this one, suppose it will be same for most of pressets): line 14: shader1 = “…/…/shaders_slang/interpolation/shaders/b-spline-x.slang” in my case path: /shaders/shaders_slang/interpolation/shaders/bicubic/b-spline-x.slang
line 25: shader2 = “…/…/shaders_slang/interpolation/shaders/bicubic/b-spline-y.slang” in my case path: /shaders/shaders_slang/interpolation/shaders/bicubic//b-spline-y.slang
I suppose a lot of different shaders were moved inside retroarch dist. My retroarch version 1.22.2 (git: 69a4f0e) if this make sense as default shaders are not tagged anyhow
After changes shader presset was successfully loaded by retroarch (they should add some kind of debug console to track errors, or I dont know about it)

