After defeating the Enderdragon, I still don't have the advancement 'Free the End.' I think this may of happened because I did manage to end up dying during the final blow (I used beds to inflict damage) but was close and quick enough to see it explode. I have respawned and killed it again but still nothings happened. I also (don't know if this is directly related or not) cannot get through the portal that leads to the end city's. I have set up the proper way to get in and even got the advancement 'Remote Getaway.' Is there anyway to fix this?