You cannnot transfer the “feats” or showings of normal Asgardians to that of Undead ones. Use living Asgaridan showings for living Asgardians. You want to get a mod ruling on this so we don’t waste time? You have no proof that Mjolnir was destroyed by anything other than strength. You are just speculating.
Really?
The undead Asgardians were the elite soldiers who fought in real war, not the living ones who were built in peace time.
The undead Asgardians were buffed by the eternal flame, which was a big magic bonus.
The undead Asgardians were very strong and fast, they were owning the living ones badly, even Heimdall almost got killed by them.
Tell me where did it say their durability were lower than the living ones, when they got such high strength, speed, fighting skill and got very strong overall menace to the living ones?
I don't? Hela had a whole movie to show her strength and it's obviously not really high, her punches and dagger throwing both proved that, of course it means her crushing Mjolnir feat was magic.