Zealoth's oath doesn't work with Eternal Life

With zealoth's oath and eternal life ES does not regen at all.

Life regen fills health bar but when it comes to ES literraly nothing happens

I am having this same issue.

I'm not sure if this keystone works if your life is full but I expect this to be intended if your life is not full.

If your life isn't full then you have no excess life recovery as it's still trying to recover life even though it cannot change.

At any rate, the poe2 wiki page for Eternal Life states that Zealot's Oath doesn't work.