I am pointing on pixel accuracy here …
This is about an image-texture baked with cycles ,
applied as material using BSDF diffuse and normal input.
(here rendered using evee, but cycles shows the same effect)
I noticed some shading issue :
there is some black spot at the edge - it was expected to become silver-gray.
It is related to image-pixels.
Looking at the texture,
I found that the (baked) pixel margin had an unexpected normal color.
also, some pink pixel is in the area, that should be violet (see image).
Does this mean , that cycles needs more accuracy when baking textures ?
or maybe that the margin is extended with wrong normals or in wrong direction ?
here the shaded version: