Decimating strike does nothing on Monsters from some Abysses in maps

It either works for all monsters from Abyss or for none. This means when map contains 2 Abysses, one of them will be immune to Decimating strike (and whatever else, I dont know)

it was working fine before I stated taking Abyss Atlas passives. Currently have one that adds additional Abyss to the map, and Sprawling Rupture

update:

I am no longer sure it is related to atlas passives. I specced out and problem persists

Still think it sometimes works, but most of the time does not. I can clearly see monsters on full life with damaged energy shield (I use no DoTs whatsoever)

I have also experienced this. From what I can tell, it seems like it only occurs for the empowered monsters standing on top of the abyss, but not those that emerge from the pits. Also, I think it is always doing a little bit of damage with decimating strike, but much less than it is supposed to. My guess is that it is using the monster's life pre-buff and thus calculating the damage wrong.