So in the Avatar Editor when looking from a right angle on your Avatar in 3D, green lines will appear on the top of the avatar. This happens only when you don’t wear a shirt and you have the right skin tone.
This happens everytime. You have to wear no shirt and a bright skin tone, for example white or cool yellow. It happens the most with cool yellow coloured skin. I am 90% sure these lines are unintentional.
This happens in the Avatar Editor
This is what it looks like:
I always use the Chrome browser. My GPU is a NVIDIA Geforce GT 750M.
The bug was there for a long time already, I was just too lazy to report it.