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Shields and knockback
for those who are posting it as a bug: shields, when they negate 100% of the damage from an attack, can also negate other effects including knockbacks, stuns and other debuffs. this has been a thing for a very long time, if a crit single target shield is causing you to fail a mechanic revolving around knockbacks, stick to aoe shields or/and other forms of mitigation (example being kerachole and expedient).
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Are you talking about the 2nd boss on savage? Because in that case the knock still happens, it just instakills you if you take no damage from it. I'm not a very experienced raider but that does look like a bug.