Normal map showing polygon edges after bake

Normal map i baked from a procedural material shows polygon edges on render, how can i fix that?
I did try to apply “shade smooth” again

Baked on the left, procedural on the right


The normal map itself:

The polygons don’t seem visible in the texture itself, so it’s probably not a baking problem.

Have you set the normal map to non-color like is needed when applying it to the material?

non-color