This has been a problem since the Scalebreaker and you're right, it's getting real old. Should of been fixed within the first patch IMO. Not only does it fail to give major brut at times but also and more importantly it does not give you snare immunity at times either which is annoying AF.
It glitches out and fails to apply the buffs at time if you already have another case of major brutality. So for me if Netch is already active, forward momentum will glitch out. Needs to be fixed asap for sure.