After last patch i’ve experienced an increase of stagger resistence not before but AFTER they are primed for explosion
Tested in the meat grinder with creature spawner mod, damnation difficulty
here i show that i manage to stagger them when they are still far with a single bolter shot
here i shot him after he became primed for explosion but failed to stagger
here i tested with shotgun and it works just fine oddly
here is with the plasma gun standard attack
i also tested with the flamer primary attack and it works just fine
here i’ve shot 2 rounds at it with the bolter and it got staggered