I cannot cook any crystal, transparent shaders (but it is working in editor)?

Development Rendering
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1

In that picture you can see that I am testing 3 different transparent shaders. 2 are from Amberify, and one is just a simple one I created.
All of them are showing correctly inside the editor, the problem occurs only in a cooked package, in Development or Shipping mode.
I have tried to look for warnings or errors in the cook process but nothing happens, the shaders are compiled with no warning whatsoever.
This problem has started when I authorized virtual textures. But I have checked that all these shaders are not using any VT, and anyway if it was a problem with VT I would have errors or warning.
I am using forward shading, DirectX 12 and I am using a RT4090 video card.

I am out of options, that is why I am posting here, with the hope that someone else got this issue and fixed it.

unreal-transparent
unreal-transparent1920×1080 455 KB

2

been out of the loop, but --and this is a random guess-- are they set up to use nanite?
Because nanite nopes on translucency. though… I’d expect you to notice in-editor as well.

3

I have turned off nanite. I do not use it in the project. But it is an interesting point. I will dig in that direction to see.

4

The problem seems to be related to REFRACTION. When it is none, it works. When it is on, the shader is not cooking. Anyone got the same problem?