4/29 Update:
For everyone else: Requiem and I were talking in the Discord and we caught an issue in the SimulatedLightingExpansion. I think this was the root of the issue, in that the functions that I use to grab screen coordinates to the shader wasn't present in the uploaded version.
The functions excluded should now be bundled with the SimulatedLightingExpansion file and should work properly. The Regicide and DramaticReveal templates are otherwise fine and untouched.