!!EDIT!! - i made a mistake, and the problem is related to Polarize not applies its armor strip correctly, best seen on high level Corrupted Butchers, who has very low armor amount. Still, the problem of targets being randomly un-affected by Mags abilities remains.
Armor reduction is applied to certain random targets, but **never** to all units affected by Crush.
100% reproduction rate, not simulacrum specific (confirmed to behave in the exact same way in normal missions too).
~~Painfully easy to recreate & observe: build mag with nothing but augment and enough strength for a