Quest Issue: Scarlet Stone for Iksar shackle of Bronze quest

[Vexxed]

I've killed dozens and dozens of drolvarg snarlers and yet to see this stone.

Research also says drolvarg scavengers can also drop this but I've yet to see ANY spawn.

All the other quest drops for this shackle dropped within the first 10 or so kills, this item is not supposed to be this rare which leads me to believe it is bugged.

Thank you for looking into this.