Adding Metallic & Normal Maps to a HLSL Shader

[pliant wave]

Hello! I'm trying to recreate the painterly shading effect shown in this video here but in URP. I've already recreated a fair chunk of it, but I've hit a wall when I've tried to do the Metallic and Normal maps. I tried on my own, asked ChatGPT, and I can't seem to get it to work.

Below are two versions of the shader. The first one has everything that works correctly until now; the second one has my best try to get Normal maps to work but to no avail lol (Didn't even try to implement the Metallic map yet because they doesn't even work on the original video's shader and I have no idea how it could work).
https://paste.mod.gg/vdfkqvyafiiz/0
https://paste.mod.gg/vmgtyhcbiayn/0

The images are the same, first one being with everything working fine so far, and the second one with my attempt at Normal maps. You can see that a weird shadow appears on one hemisphere of the sphere and the specular reflection also breaks. No idea what to do next. Any help would be greatly appreciated 🙏

[viscid jackal]

Maybe a copy paste error, but I don't see any normal map in both shader code 😅

[pliant wave]

fixed the links, ty

[viscid jackal]

I don't see an obvious issue for the moment ...
Is the normal texture properly imported as a normal map (normal map mode in the import settings) ?
You can also try to debug the values, by outputing the normal value in the fragment output to visually check if it seems correct.