Blender: Normal map artifacts along edges

Hi,
I am having an issue with a model and normal map.
I'm getting dark artifacts along the faces that meet a sharp angle.

I've checked against a matcap shader and both Blender and Unity, and it's only occuring in the latter.
Left is Blender and right is Unity.



I've attached a package with a sample model that replicates my issue.

I posted the issue before, but it never got resolved it seems
Any help is appreciated.
Thanks.