Hey, for your information, here is why your code is not working properly.
If a folder contains only images you can load all textures inside with: [folder_name] = {},
But if a folder contains subfolders and images you have to write the following: [folder_name] = { ["*"]={}, [subfolder_name] = {}, },

Thanks! I kinda figured it out on my own after testing it and noticing things weren't properly working for entities and the like. Had to reconstruct what I screwed up. I want to make sure I get it right, here, before updating and un-deprecating them. It's looking good so far, at least!