Minecraft: 1.12.2
Forge: 14.23.52772

Mods: 7
CodeChickenLib-1.12.2-3.2.2.353-universal
conarm-1.12.2-1.2.0.1
jei_1.12.2-4.13.0.219
Mantle-1.12-1.3.3.39
NotEnoughItems-1.12.2-2.4.2.240-universal
TConstruct-1.12.2-2.10.1.87
TinkerToolLeveling-1.12.2-1.1.0

Info:
If you have Absorption via a Potion Effect or using the Unnatural Absorption Mod and your armor has Resistant Modifiers, the damage won't be reduced.

For testing... the Armor I used had Paper Cores which has the lowest armor value and Manyullyn Plates & Trim, all 4 Armor Pieces had Resistant VIII which I think equals to Protection IV. I had a Zombie Pigman use me as a punching bag.

Game difficulty was on Hard Mode.

Without Absorption... the damage that the Zombie Pigman dealt to me was 2 Hearts (4 Health).

With Absorption... the damage that the Zombie Pigman dealt to me was 5 1/2 Hearts (11 Health).

Wearing a full set of All Paper Armor with no Resistant Modifiers and having Absorption... the damage that the Zombie Pigman dealt to me was 5 1/2 Hearts (11 Health).

This may also effect the other Resistant Types, such as Blast, Projectile, etc.

A Full Set of Vanilla Leather Armor with Protection IV on all pieces...

2 Hearts (4 Health) without Absorption.

2 Hearts (4 Health) with Absorption.