Kingdom Hearts 1.5 Remix black screen after New Game

I wouldn't try to use vulkan for KH. OGL has worked a lot better in my experience. These settings seem to work great for me

PPU Decoder: Recompler(LLVM)
SPU Decoder: Recompiler(ASMJIT)
Preferred SPU Threads: Auto
Enable SPU loop detection

OpenGL
Aspect Ratio: Auto
Anisotropic Filter: Auto
Framelimit: Off
Default Resolution: 1280x720
Resolution Scale: Default
Resolution Scale Threshold: Default