Lord of Horrors passive node not working

It supposed to reduce spirit reserved for my minions.
But activated or not, my skeletal sniper, for example, at level 25 with 20% quality gem (that decrease spirit cost by 10%) costs 29 spirit.
Tried different approaches as I read on forums that others have same issue (like 0 to minion, activate node than add one by one, and so on) but nothing works for me. Same 29 spirit cost.
So this passive node that is so important for a minion build is broken.
Please consider to look into the issue and fix it as soon as you consider that worth your attention.
Thank you.

UP.
I'll try to keep it daily alive until it's been solved.

UP.
Still struggling with the issue.

UP.
Wondering if I'm the only one who`s struggling with this.

Haven't made a minion character, so haven't been in a position to test this myself.

Are you only looking at the skill's tooltip, or does it actually allocate 29 spirit for every Skeleton Sniper?

I'm playing a minion build. So I actually have a solid knowledge about spirit reserved and every minion cost (not only looking on tooltip).
For example, to put it in different way, with full minion coverage I have 4 spirit left. No matter if I activate or not that Lord of Horror Node. Still 4 spirit left.
Yesterday I found a pair of boots that decrease minion in spirit costs by 20% (too bad that it doesn't have some speed increase too). And If I'm wearing that, boo, 100+ spirit left on the fly, making room for other minions or whatever. This kind of change I should see when activate that node too (of course, according to it's own decrease, that is 12%). But is not the case about Lord of Horror.

UP.
...another day.

UP.
Just checked and I still have 4 spirit left.

UP.
8th day.