When trying to port from a dungeon to Cerrigar (either with Cerrigar being the default option, or specifically selecting it from the map), the town portal completes and the screen goes black (as if to go to the loading screen), but then returns to the dungeon I’m currently in. Teleporting to other locations (tested: Kyovashad and Firebreak Manor) works as expected.
I also cannot enter Cerrigar manually (i.e. by porting nearby and trying to ride in); I’m prevented from doing so by rubberbanding.
Hope this helps!