Noise orientation problem

[XavierH]

I have a classic shader with a noise displacement texture that's oriented correctly like this:

But when I add another noise texture to the refraction roughness parameter (regardless of whether refract is enabled in the classic shader), 

It looks like this: 

As if it's not taking the rest position node added in the SOP level into account. Why is this happening and how can I fix it? Is it a bug?

Here is the scene file: crystalsTests.hipnc