linked_portal_door SetPartner not working?

[Edward]

Ok, so I have quite a few of these linked_portal_doors. I have one at the end of the "Elevator" and one at the lobby "Entrance", one at the lobby "Exit" and one in "Level1", and one in "Level2".

The Linked Partner for "Elevator" is "Entrance" and the Linked Partner for "Entrance" is "Elevator". That works well.
The Linked Partner for "Exit" is "Level1" and the Linked Partner for "Level1" is "Exit". That works well.

Now, when I pass a trigger, I SetPartner of "Exit" to "Level2". When I look back at the door, it doesn't show "Level2" but the blank wall of the alcove I put the "Exit" in.

Why does this happen? I've made sure these are pointing in the right direction. I even added a SetPartner of "Level2" to "Exit".