Have been noticing this for some time now, players just straight up not taking damage when they should be.

Today I was playing a match as MCH in Platinum tier and was facing a DRG. He had no damage mitigations that could've mitigated against an 36000 potency LB. No sage was on their team to shield him, and he wasn't using his own shield. Still, I hit my LB and watched him take zero damage. How is this even possible? I'm not the only person to point this kind of thing out. I genuinely think something shady is going on but I can't quite put my finger on it.

But whatever the case a MCH LB should not do zero damage against a target not using mitigation buffs or shielding. Flat out, that should never happen.