Well if you have everything setup correctly,
you should have 2 shaders, which share the same blend.
k,
Then the blend on it, has to be in a specific range of alpha values.
That means, it can be between 0-255, but the actuall transition
(at least if you do use socks example shader, which AFAIk has a alpha_func ge128 or something like that),
has to be at 128, with the tool GIMP you can check that. That means if u do filter the all the values below alpha 128, you get the nice effecrt in socks example, yet if that is not the case, you can get various results - but not what you wanted there…
I guess the term is ‘Threshold Alpha’ for photoshop, with that you can like preview what will happen with ge128…
Well maybe it has another reason, but I guess its that.