Before traveling to the Isle of Mists you get a warning specifying that some quest may fail if you go past this point. The first time I was about to cross this point I double checked that I had completed all the quests listed on the Wiki. After crossing I got a quest failed notification for Berengar's Blade (I had already discovered the quest before crossing). I loaded up an old save and completed the Berengar's Blade quest, and crossed again. I haven't gotten any quest failed notifications after crossing but I did get the warning again. I'm concerned that I might be missing some secondary that isn't listed on the Wiki since I might not get a quest failed notification if I haven't discovered the quest in the first place.
So my question is do you always get that warning or will it only be present if you are going to miss something?