Sometimes I can clearly see that i've domed them, several times even, and it won't register as a crit. Other times their heads explode just as it should. I've not experienced this sort of inconsistency on any of the other new enemies.
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It is super frustrating! It's like you have to shoot them in the throat for it to count as a crit. I have tried shooting the tip of their head and it counted as a body....