BlinkSync

After flashing the UK BTU firmwire to my Phone to get Nougat asap since BTU was the first one that got it in Europe, i noticed a small grey line on the very upper corner, where the time is. It's like a shade, it doesn't look like dead pixel, its not black, its kinda transparent, like dirt, it wont hide completely all pixels on this place. This is only visible on light and bright colours:

I don't think it was there before the update, but, i might be mistaken. Any ideas whats that thing there? its kinda annoying, since its in the place of the time, it doesnt affect its visibility much, but, its annoying..

ncG1vNJzZmien6fCrr%2BNmqWdqp%2BesaSxza2pmqRemLyue9OhqZ6ZlKh8uLTArapmrJiWwW6z0Z6wZqugpMFvg5Vrb2ppXw%3D%3D