Like many others I was slowed down by the ol'stinky bug on Sanctum of Rall. well after a lil research I found that it wasn't bugged on Tarnished Coast. so I just gusted myself over to there and low and behold. there it was.
if you don't know how to guest here's a lil walk through for you
at the character select screen open up the world tab
click on tarnished coast
then click the button 'guest'
click play.
you will be on Tarshined Coast until you log out of the game and still get the bonus for completing it.
Enjoy