PBR normals get cutoff. Specular workflow doesn't.

[Senseless]

I've noticed an issue with PBR materials -- I made a simple brick texture with the normal map suggesting each brick is angled a bit off.
At sharp angles, or if the normal map is strong enough, light on PBR materials just seems to get culled at a certain point. This doesn't happen with specular+normal materials.

This happens on both vulkan and OpenGL, with up-to-date graphics drivers, on the latest official build.

OS: Win 10
GPU: AMD rx590 8gb
CPU: Ryzen r5 2600x

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[Darkcrafter]

I could test the same scene with my GTX 1060 3gb if you don't mind to share it.