[SoD] Rune of Flanking Bug?

WoW Classic Season of Discovery
Char: Nausicaa
Realm: Penance(AU)
Issue: I try to get Rune of Flanking, loot Teldrassil Bird Meat from Owls, bait Mowgh the bear at its hideout around 48 X, 31 Y (doesn’t look like a Den as described on the Meat info), kill it and nothing drops. I repeat this 3 times, nothing drops at all.