I completed one run perfectly fine, the next run was fine all the way until the final boss encounter which wouldn't spawn or update. We ran around, wiped a few times, the objective marker wouldn't update to the final boss and we ended up needing to just abandon the run entirely. I tried to run it again and the same thing happened with a different group. We completed the entire run up to there and then just couldn't complete it. Just wasted time for literally nothing twice in a row now. Has anyone else run into this issue?