I wanted to share this for anyone else that has been, or will be halted at this questline, because you cannot progress to Coldharbour without finishing it. I read on the EOS forums that grouping with someone at the same part of the quest works. I tested and it does. I was standing outside the entrance to quest location and invited 2 others that were also standing there and bugged. When we went, we were able to speak to Joruun and progress through the quest.
I hope this helps anyone stuck at the part.