The bug and the screenshots speak for themselves. No video proof needed. Just open up the latest Beta / Preview and the player will be invisible. Even switching to another player skin won't fix it, as it'll do the same anyway.
Edit: The first image is when I'm in first person, as you can see that my arm is not there. I'm not even holding anything invisible. The same thing applies when I'm in third person (front) as shown in the last image.
Absolutely no Invisibility effects on me at all. It's a literal bug.