Cycle of Putrescence is also bugged?

It says that it is increasing poison damage of my minions damage over time spells.
Zombies Vomit ability is a spell, it is poison damage, but it isn’t affected by that ring, at least tooltip damage is not reflecting that when I’m wearing that ring…
It seems that it doesn’t affect Pyre Golem’s Infernal Aura either…
If not that, then which minions abilities are affected by those rings?..