Defenders of darrowshire is bugged, 14/15 no matter how many diseases flayers i kill and spirits I speak to they dont free

WoW Classic WoW Classic Bug Report
1

Defenders of darrowshire is bugged, 14/15 no matter how many diseases flayers i kill, and no matter how many spirits I speak to, the last doesnt free

ok it worked but it took like 15 defenders for the last hand in, is this intended blizzard