As a paladin with circle 2 bokor (I know I know before I hear a single word of it. I still like the build even with the problems I have.) I’ve noticed that zombies get zero benefit from restoration’s regen and do not display the buff icon. They also do not receive the doubled heal base value.
This seems almost like a bug or overtune issue since I know you cannot buff them as a priest but other priests can buff your zombies- But restoration doesn’t seem overpowered to have on the same character just for the sake of the boosted heal value alone to give them some survivability- And restoration itself is such a mild bonus. So it strikes me more like this might be a bug more than an intended mechanic.