I take it the Bug-tracker was taken down for 1.109 Beta?
Nano Armor absorbs no damage at all, changes to electric armor seems to also make it not absorb general mob damage. At the moment, even leather is better.
Just tried with full Quantum armor, chestpiece and all. Got one-shot by a creeper. So yeah, it's absorbing no damage what so ever, explosive, mobs-damage or otherwise.
Ah, strike that. Q-chest does absorb fall damage, but that's pretty much it. Falling down 40ish blocks hurts less than a skeleton looking at me.
that would be the Q-boots witch stop fall damage.