Epic Games has released Unreal Engine 5.2 Preview 1 and now, in order for the path tracer to work, we need new ‘proper’ UnrealEditor-D3D12RHI.dll because the old one is not working correctly.
If anyone has complied it, please share…
PS.
Unreal Engine 5.2 Preview 1 was updated to Preview 2, but we still don’t have a proper UnrealEditor-D3D12RHI.dll 
This problem (enabling PT for GTX or compiling proper dll) could’ve been solved by EG, but unfortunately they DGAF about it.
PS. I can’t compile it myself because I don’t have enough free space for the process.