If an entity kills you (including other players) it turns invisable to you.

The Bug isn't very constant happening for my young cousin and I about 30% of the time (we were testing out the new crossbows with a small pvp world that I made in      [Minecraft 18w48a]) I was recently playing in [18w48b] and noticed the bug after a creeper blew me to half a heart and a zombie killed me. I went down to collect my stuff and freaked out after I was hit by invisible blows. Then I realized that the groans of the zombie were right next to me. I think it is the same bug from the previous snapshot and possibly before that one also.

Thank you and good luck

 Im sorry, I couldn't get a video file of it on camera or a screenshot