SOLUTION: Repair your game AFTER you reach level 30!
First time posting on the forum just to say that I had the same bug, after the last dialogue my character got “stuck”, I couldn’t talk to any npc or leave the instance map. The quest log on the right said it was completed but nothing popped on my screen saying so nor I could get my rewards, I was forced to leave the instance map when my partner did so. Outside my quest log had the text "You have an important Letter” “Read your Mail” and there was nothing on the mail. Also the quest indicator on the map was pointing to the place where Liberation starts, but it was swirl indicator. I immediately repaired the game but nothing changed (I was level 23 I guess…). So I continued to level my character and when I reached 30 I tried to repair again and it worked! Now I can play with my girlfriend again! :3