My group had this issue in the heroic version today. To be clear, we killed Morchie without any issue. We looted Morchie’s dead body and got nothing exciting (per usual). Familiar faces then spawned and kept us in combat and did not allow us to take either portal on Morchie’s platform. We committed group seppuku by jumping off the ledge, but were kept in combat even after this. We were not able to ressurect even after everyone jumped off. We were not able to fix this issue, and everyone left the group whilst being greatly disappointed in this new dungeon.