[Bug] Co-op Kerrigan prestige: Folly Of Man doesn't work

Title ^

According to prestige advantage description, using leaping strike or psionic shift is supposed to stun enemies. It does not.
The disadvantages does take effect though.

The behavior applied to units stunned, according to the map editor, is CommanderPrestigeKerriganAbilitiesStun, and it only last “3” (seconds at a certain game speed).
Maybe it’s too short to notice?

Also, it doesn’t work on Heroic and Map Boss units, and it is an effect performed by the additional lightning bolts born from using an ability while having a certain amount of Fury enabled, not from the main ability itself.

I think I should have covered all the grounds?

Is this supposed to work from level 1? I’m using prestige “Folly of man”, I’m at level 2 right now but the stacks of fury don’t work so far. Is this a bug or a specific level this gets triggered?