I want to know how the option "Volumetric static/dynamic" works
I'm working on the backport of the LittleFrames mod and several shaders have the same problem with that specific option.
for some reason it only renders the shadow but not the image.

SrRapero720/waterframes#1

I've been trying to figure out why for a while but every time I'm more lost.
and I ask how that option works to have a clue of where to search or what to search for.
I know the problem is mine because it happens with several shaders.

I have answered you in the thread of your own project.