Ahoy!
The “Clear undead from the oasis” event in Bloodtide Coast is bugged. It’s in the Whisperwill Bogs, at Cesseilia’s oasis. I’m currently playing on the Dragonbrand server.
For the past 20-ish minutes (if not longer, it was already in this state before I got there), the event has not progressed at all, and is therefore preventing us from doing the Heart Quest.
Essentially, we need to eliminate undead from the area, and there’s a counter that tells us exactly how many there are. However, only two are ever present at once. Once we kill those two undead, the counter remains stuck at 6, at which point there are absolutely no undead in sight. After a few minutes, the two undead we killed will respawn, increasing the counter back up to 8. Thus, the event keeps fluctuating between 6 and 8 undead, though 2 are actually visible.