QMaterial with just a rhi technique

[RGHuertasPaiva]

Hello! I'm developing a 3D application and I need to write a custom material. If I write the shaders for opengl 3.3, it works, but if I write it just for RHI, it doesn't work. And I can tell is not my shader. How? well, try this:
Open the "Simple custom material"(the red square) and in SimpleMaterial.qml comment all the techniques, except the RHI one. You'll see that nothing gets drawn, just the background.

I really, really would like to write for the RHI, but If I have to write for both ogl3.1 and rhi, makes no sense. Is there anything else i am missing?

Thanks in advance!