Blender Eevee Negative Emission Removed from 4.0 to 4.1 without a trace.

I've made a geometry node setup using Blender 4.0 that relies heavily on using Negative Emission colors in Eevee to subtract color from a underlying image.

But in Blender 4.1 the Negative Emission is gone! But I really want to use the new Menu Switch node in my Geo setup.

I can't find anything on this in the changelog or even find other people using Eevee in this way.

In the example below you can see the Negative Emission Plane subtracting blue from the image below. And in Blender 4.0 it's just transparent.