Unable to completely replace vkd3d with vkd3d-proton?

I tried replacing Wine’s built-in DLLs with the d3d12.dll compiled from
vkd3d-proton and the dxgi.dll compiled from dxvk.

However, I noticed that Wine’s built-in D3DCompile2 still calls
vkd3d_shader_compiler(
https://gitlab.winehq.org/wine/wine/-/blob/master/dlls/d3dcompiler_43/compiler.c?ref_type=heads#L573),
which belongs to vkd3d, not vkd3d-proton.

Does this mean that even in Proton, vkd3d and vkd3d-proton coexist, and
it’s not possible to completely replace vkd3d?

So if there’s a bug in it, I would still need to fix the issue in vkd3d
rather than being able to replace it with functions from vkd3d-proton. Is
that correct?