Title. I got stuck on stage 3 of 4 in the Defense of Karabor scenario while questing in WoD Shadowmoon Valley.
I killed Arnor the Burner, or whatever his name is, and got credit for it as part of Stage 2. The second requirement for Stage 2 was to talk to Yrel.
I talked to Yrel, and she just said 'We will hold the temple. I will not accept any other outcome." and there’s no K’ara to defend. There’s no orcs on the dock side of Karabor, and everything is just very clearly bugged.
Nothing else appears interactable, but my objective still says ‘defend K’ara.’
I tried going to Character Select and coming back, I tried logging all the way out, I tried Hearthing back to my garrison.
Someone in a thread deep within my googling mentioned invasions being a problem for turning the quest in, so I went back to my garrison (by way of my regular hearthstone and travelling back from Ashran) and did the Shadowmoon Invasion! quest. Returning to Karabor after doing this quest made it work properly.
Fix your game, Blizzard.
edit: side note, K’ara makes a much better wall than a window. Why is everything so bad for cameras?