Tri-planar projection on fill layer causing black patches on normal map.

[Kharak]

Greetings, 

I've run into an issue I can't seem to solve or find any info on. When I use Tri-planer projection on my fill layer, parts of my normal turn black. Adjusting scale or Y axis causes the black faces to jump around. This issue is not present when using other projection options or when changing the Filtering to nearest. Perhaps someone knows what's causing this issue or even how to correct it!

Cheers!

[Kharak]

Here is a quick capture of the issue: 
https://i.gyazo.com/3eea80bf542c1f3758942516841033e2.mp4

[Kharak]

Well, while I have not found the cause of the issue, I have found a suitable work around by moving my normap texture map into the hieght map slot of the fill layer, with a little adjust in the levels it matches pretty close to how it looked in the normals slot.