Hey there !
I cant show you because i dont have it, and im still trying to find the video i mentioned but… it was 1 year ago and i have been not able to find it yet.
It was a video about creating a terrain and a forest in UE, and while the near objects were good with kuwahara, the far objects (mostly tress or some thin railins from a bunker) got all black lines around edges.
I think it was mostly every this object was getting them.
I just saw your Kuwahara video (https://www.youtube.com/watch?v=2ubd4ZRYthw), and it looks good (i love this effect i think its the better one in the pack), there are no black lines going on… except for the rear tall tower which has some black dots and specially the “Jewelers” sign at the right.
The guy was getting the same black lines as in this Sign, but all over the tress (it was a mess).
This other guy at this post (page 4 at the bottom) also posted about this, but never got a response.
If you make a map with a forest i think you will see it.