Shield Pylon - Random damage?

Multiple times I was testing the Witch Doctor set rework, with shield pylon I took damage - from Molten, from random mobs and had my follower cheat death procced on me. I was still using my full rotation since I’m using the helm shard for abilities on CD to give attack speed, so I continue spamming all my normal defensive layers, so what gives?

This is not a PTR-only bug and happens very often on live servers, and also was reported multiple times on the bug report forum. If you are sure that your life was reduced as a result of damage, and that not only cheat death was procced, then it’s something new.