Description

This part of the T0.5 Quest happens in Stratholme, but there is no marker for it on Stratholme.
There are 3 other variants of this quest happening in other instances.
So 4 quests and you get assigned one of them.

Later down the quest line the same thing again for the right side of the amulett: one of 4 quests.

Wowhead link

https://classic.wowhead.com/quest=8968/the-left-piece-of-lord-valthalaks-amulet

Screenshots

Questie version

6.0.5

Thanks for the report.
Fixed with 192b391.
Will be included in next release.