Well,I don't know, you can check here: https://github.com/libretro/beetle-psx-libretro/issues
and if nobody reported this you can create new issue there.
Make sure to test last stable and last nightly build before reporting it, maybe it's already fixed in nightly build.
I allready posted that issue...
I found the same problem solved, but not for me :
PGXP - Perspective corrected textures - Untextured polygons with solid/graded colors bug · Issue #257 · libretro/beetle-psx-libretro
This issue was best described by @rz5 When using the 'Perspective corrected textures' option, untextured polygons with solid/graded colors will incorrectly get rendered with some sort of ca...

My report are here:
Most filters under Vulkan cause GFX problems [PGXP related] · Issue #527 · libretro/beetle-psx-libretro
Description Using xBR, SABR and 3-Point cause bad GFX , under Bilinear, JINC2 and Nearest no problems at all. Just choose xBR, SABR and 3-Point with Vulkan render. Some games (as i checked are impa...

The thing are it seem no one have same issue of me.... RTX related?