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A fix for it, is close the graph window and reopen it. Not a great solution but a working one.

Well it makes me feel better knowing you get the same bug I have. Additive means add on top of the pixels "rendered" behind it. This is adding on top w/o rendering geometry pixels behind it. I only get the skysphere.

You can test this by taking a noise texture on this additive unit material, apply ...

I wanted to make 2 panning noise textures slide across each other. Made texture coods into panner, into UV's dup that and mult both results. You cannot have the same texture 2x in amplify. Just outputs white.
Correct:
bug_dupTexture2.jpg
Second texture fails:
bug_dupTexture.jpg
Exact same ...

Why is it so complicated to make a simple unlit additive material? Way too many, very unintuative, settings for this commonly used shader type.

How do you make an unlit additive material? (This is for God Rays on static planes in no particles.) My issue is while it does become additive, it also it ...