Death triggered abilities trigger when Hushbringer dies
Abilities that trigger upon a creature dying trigger when Hushbringer dies.
Steps to reproduce:
1. Wish for and play Hushbringer, Nightmare Shepherd.
2. Destroy Hushbringer.
Actual results:
Nightmare Shepherd's ability triggers.
Expected results:
Abilities do not trigger when Hushbringer dies.
Notes:
Abilities also trigger for creatures that die at the same time as Hushbringer, such as Garrison Cat dying with Hushbringer.
According to the ruling for Hushbringer: "A creature entering the battlefield or dying at the same time as Hushbringer (including Hushbringer itself entering or dying) won’t cause abilities to trigger."
This issue does not occur when Hushbringer enters the battlefield.

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SwiftKitten#06539 commented
same issue, i casted "blasphemous act" with my hushbringer on the feild, and they still got to draw from thier runed servitor
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anaphysik#31390 commented
Here is another example of the Hushbringer bug:
Steps to reproduce:
1. Bridge from Below is in opponent's graveyard.
2. Player's Hushbringer dies.Actual results:
Bridge from Below's ability triggers and is exiled.Expected results:
Abilities do not trigger when Hushbringer dies, so Bridge from Below should not trigger and so should remain in graveyard.