Instant minion death despite 100% chaos damage

I was just in a map and my minions, which convert 100% of their physical damage to chaos damage, just instantly popped themselves to random blight mobs. Golem, zombies, spectres, and a richly outfitted animate guardian instantly died.

They can tank literally everything in the entire game but in a map with no damage mods (or even native reflect) they poofed which means they were taking reflected CHAOS damage somehow.

Completely sucked all the fun I was having playing the game. Think I'm going to retire after I hit 40. This is just bullshit.