Lemme break down why the eye is hard to determine
> The eye is white
- How do we know? The Manga is in black and white the moment he opens the damn eye, so we can't determine what color it really is. For all we know it could be: red, purple, blue, orange, etc.,
See what I mean? Plus there's no veins around the eye when he activates it. I mean I totally can see the connection through Mitsuki's Sage Mode, it would be interesting to see if the eye looks like that through Sage Power, rather than it being a completely different Dojutsu all together.
Like imagine them using the eye and seeing through things via Natural Energy, or something like that. It would be cool. Anyway that's all I gotta say about the Byakugan thing. Let's wait before we point fingers and state what it is without any real proof. I seriously doubt the new author is that much of an idiot to forget that the Byakugan has veins or not.
Let's see how Momoshiki or Hinata use the Byakugan, since we both know they use them in Movie (Hinata when Boruto is cheating, Momoshiki uses it during the Chunin Exams I believe).