Zz'Rot portals minions & Bandit mastery

Ok so I´m not entirely sure if what I disovered is a BUG or a FEATURE:

When running the bandit mastery of the cunning tree, you get 1 gold for each Voidling the Zz'Rot Portal summons (if you are near it when it dies).

Seeing that they don´t reward any gold when slayed, I´m not sure if this is intended.