Regeneration from Leech doesn't apply to Zealot's Oath

I have been testing around the regeneration like Leech, gain life from kills, but none of those except basic life regen is applied by Zealot's Oath for ES. While Zealot's Oath said: "Excess life recovery from regeneration is applied to Energy Shield" "Energy Shield does not Recharge".

Is this a different recovery? if it was put in the same category, it should have been worked.

Leech isn't recovery, not even increase life recovery rate nodes apply to leech.

Leech is a separate mechanic that only "increased amount of life leech" affects it.