I think PVE got patched with some kind of modern AI miss chance mechanics. You know, the kind where even if you get hit, the game does another roll to check if it deals damage or not. I'm intentionally getting hit to farm vitality and damage some armored rigs for Ragman's quest, but probably 66% of scav shots don't do damage to me. Some of the shots even have buffs of blood appear right in front of my vision, which seems to imply the hit should've been a headshot. On the other hand, PMCs were still two tapping me in one shot from the front through a tier 4 face mask, tier 3 soft neck, and a tier 6 front plate.