During the second LS mission, in the fight against the 2 veteran golems to free the zephyite, my ranger fell through a crack in the platform and to the ground below.
There he remained in the face-down fallen position while still able the move and even jump normally.
Kasmeers speech loop for teleporting the character back up was triggered, but the portal didn’t take effect. Only when I jumped farther up again (in fallen pose until I used my heal) I was suddenly yanked back to the fight again.
By then I had already used the lightning stone and was almost back in the fight by my own means.
I might add that my computer had quite some performance issues during the mission, maybe that contributed.