Magma cube obliterates my shield

I'm not very sure if it's a bug or a feature, but I was playing in my hardcore world, when a magma cube attacked me, and when I pulled up my shield to defend myself, that thing absolutely crushes it causing my death in my hardcore world. I think magmas should have a cooldown like zombies and skeletons to attack and not cause any more loss.

Thank for reading this, I hope this issue will be resolved