Is Poisoned Blade not supposed to work with the Shadowcrafter Scabbs hero power?
I know this probably better reflects the text on the card, but this is not how it used to work and removes some fun interactions with the Shadowcrafter Scabbs, or other repeatable hero powers.
It would help if you said what actually happened, that made you question if it was a bug.
What did you do?
What happened as a result?
What result were you expecting instead?