Mission bug: NPC does not become interactable

[drdread]

Tried completing the tip mission "Steal the Shadow Shard Artifact" twice. I clicked on the blinkey, beat the two bosses, now I am supposed to talk to Mangle. He never become interactable however, so I can never finish the mission. I cleared the level of all mobs and went back and forth, exited and reentered, but I still cannot interact with Mangle.

[drdread]

After abandoning this tip mission, and taking it again. This time is sent me to Skyway City and I was able to complete it. I think I know why it bugged the first time.

 

When I first took it, it sent me to Khalisti Wharf, and the door was on the red side. This is a hero mission, and I think it may have been confused.