devtrackers.gg
Further info: I didn't shoot at the shield, and it's possible it's just a visual glitch. On the final kill cam all players said they saw the same thing I did. The operator had the shield in his hand while shooting. Nobody could confirm shooting at the shield and whether or not you could shoot at him through it.
The guy doing the glitch claimed it was an accident and had no idea he was doing it. His team seemed to feel like it was truly an accident, but obviously we're uncertain whether or not that's true. Either way, it's back :/
EDIT: a word
EDIT 2: Here's an R6Fix link. I really don't have much to contribute to it since I am not sure how to reproduce the glitch.