Hello author, we meet again.
Interestingly, when I tried a mod called macaw's window, I discovered that the windows provided by the mod actually don't cast shadows or even affect volumetric fog. I'm not quite sure how it does that.
To be honest, I kind of want to replace all the glass in the world with these amazing windows 😹

i actually just fixed this in the in-development versions. im planning to fix fog nit appearing behind glass too.

just find the green "code" button -> download zip