Cannot complete this and one other quest in Ck. REALLY devs?!
Ran into this issue - Same quest same bug 
Same issue, mobs aren’t interactive
yep same with me i cant do Sea Dreams quest
Not resolved after patch. Just tried it same issue
Having the same issue
Been bugged for a month now. Why do you guys keep coming out with new content instead of fixing the content and bugs you already have? That is NOT how you run a game. Fix bugs first, then create new content second. If you don’t fix the bugs soon, you will lose more people, including myself. I love the game, but damn is it annoying when you can’t complete a zone because of nonstop bugs!
Still not fixed after latest patch. Thanks
It’s fixed for me after the patch.
I looted the chest and still no astrolabe dropped, but the quest was completed.
Still bugged here. Eu-Gorias
any resolution yet devs???
Sea Dreams bugged for me too. 
I replied with the bug in Nov 19.
It’s amazing how it has been one month and we are still being ignored.
Still bugged!
Randomly decided to try again just now and there was an enemy to kill, as soon as I killed it right where the chest is the quest advanced for me. Not sure why, but worth checking out for some of y’all now.
Still bugged. Harmonia EU central
Following the advice made on this post, I just went to the mission spot.
Got a little disappointed because the game didn’t gave me any warning while I approached the Area or the Chest or the Mobs.
However, as I killed the guy closest to the Chest (the spitting balls guy) and I caught the chest, even if the game gave me no warning or special item, the quest completed and I as able to reclaim it.
I guess my advice is try it.
PS I also had the problem since early november.
Can confirm this worked - Killed one guy quest completed managed to finish the chain and complete the area finally!!
Went back and it finally completed on its own, just had to walk around/near the chest and enemy and it completes by itself.
The quest has been fixed and is working - thank you team!!