Overheal (Life Perk) Doesn't Work

As the title suggests, Overheal doesn’t seem to work. I’m not seeing healing function at all while they are at full health.

I apologize for the repost, I didn’t realize I posted this in Siralim 1’s forum. I’ve deleted the post from there.

Overheal - “Your creatures can be healed even while they’re at full health.”

I currently have the following perk setup in Life -
Abolishment 3
Desperate Prayer 10
Flash Healing 10
Guardian Angel 10
Guiding Light MAX
Luminesce 2
Miracle 4
Overheal (MAX)

What version of the game are you playing? You can find it in the bottom left corner of the title screen.

Looks like 0.11.4

Ok, thanks!