It was a nice comparison video! I really wish you didn't use the PBR material pack because it detracted from the shaders' full visual impact, it would have been pleasant to see totally vanilla textures instead.
Okay so I went into photoshop just to do a test; I aligned four netherrack textures in the natural tileable array, then I rotated each texture block almost 360• degrees and it created a star as shown bellow,
For a game based off tileable textures this is very unordinary.
I sometimes mod textures in minecraft and I don't recall seeing this unique pattern in the resources of the application, I am aware that minecraft's textures include particle systems and user-activated animations - but this nether "star" is just weird and uncorrelated.