I am relatively new to shader graph and I struggle with one thing : making correct intersection shader with two sided material.

Here are some pictures of what is happening

Without two sided

With two sided

My issue is that we can't see the contact effect from the back of the mesh, but when I activate it, the transparency is not working for the back faces...

Here is my full shader graph:

Full Shader Graph

(Two sided isn't active because I'd rather use it without than with the non-transparent sphere)

I just want some help to understand why the transparency isn't working when the full contact shader is.

Thanks a lot in advance.