It appears one of my characters, Phobos, has found himself stuck in a mountain and I cannot get him out in the least bit. I tried jumping, coming out the way I came, continue to climb through the mountain. So far he's firmly stuck in the mountain. I am also going to try load and unload.
But I just found this kind of hilarious. Climbing is a pain in the neck in this game and now it just became worse with my character permanently melted through a disappearing mountain.