Yeah I thought of that, but that is so far fetched just to get the thing done. How come there's no quicker work around? Could Xnormal bake using alpha for example?
I tried it again today, with your settings and your preset, no material filtering on every texture samples. I didnt even add the normal map so it should only bake like your example. And I still get the same result as the image above. I'm going to test it in 2010 in a few minutes but that was for 2012. I'll update this…