There is a Minor Gate that teleports you into the "Laboratory Solastan" in The Palace of Ice. From what I've read, it seems like you should be able to use the gate to teleport out of the room as well.
I cannot. As soon as I use the gate to enter this room there is no way out. Fast traveling results in a "path is blocked" error. And the Minor Gate from within the room is not interactable. There are no other exits as far as I can tell.
Kills the mood for a new DLC playthrough.