Question Kernels are not found in some compute shaders on Directx 12

I have an issue with compute shaders in DirectX 12. In some of them, kernels are not found.
When I click on show compiled code I get:

Code (csharp):

1.  
2. **** Platform Direct3D 12:
3.   no variants for this platform (no compute support, or no kernels)
4.  

There are no shader errors in the inspector. Not even a warning. With DirectX 11 everything is OK.