In my current game I'm attempting the Mastery Quest presented with the unique wildlands involving the Pit of Lost Voices. However, I'm running into several bad location spawns while attempting it, and have had to restart from earlier saves at least twice now.
The first bad spawn involved appearing over impassable terrain. Specifically, the frozen rivers in the Ice Wildlands, which remained even after I slew the boss.
I went back to an earlier save and now I'm finding the second gate's camp spawn to be in a likewise inaccessible location, although slightly different.
As the below picture shows, the camp spawned directly behind the boss and thus behind the gate it was supposed to help open up.