You know what, I am pretty sure it was in the same place for "Mount Kilimanjaro" temple run also. And this makes sense too since "Jedediah Smith" and "Mount Kilimanjaro" were taped back to back on the same production day. And of course, Heather was too stupid to find it and Casey was even more stupid to not notice it after all the time he spent in that room. 

I'm sorry, but I do not think that this is a half pendant.
If you look at the picture closely, in the circled area there's a white-ish strip that runs along the base of the opening, but it terminates right where you all believe the half pendant is hanging.
I think that what TRJ has circled in this picture is just a piece of trimming that had become partially dislodged from its spot at the bottom of this opening. I think that the trim's purpose would be to cover up the 90 degree angle so the contestants wouldn't be injured by knocking body parts into it.

I think that this is the same for the Jedediah Smith half pendant as well.
Notice that the hanging object forks in 2 directions just below the opening. As seen in previous confirmed half pendant pictures, the hanging half pendant never forked in multiple directions like that. It just laid flat against the wall.

I think that the grainy nature of TSM's comparison pic disallows us to see the trim. Also, please keep in mind that the Metal Beard episode was 18 episodes after Jedediah Smith, and 20 episodes after Kilimanjaro. So the crew would have had ample time to notice the dislodged piece of safety trim and either replace or fix it, but would have had no time in between Kilimanjaro and Jedediah Smith to fix it due to them being on consecutive production days.
Wait a minute, I just found something interesting. In "The Marble Armrest of Xerxes", Noelle gave a signal to Pat that the half pendant was on one of the middle painting buttons in the Jesters' Court. However, there was something below the same door like in the Shaving Pan and Snow Cone runs. I circled both the hand signal and spot below the door.

This quote further solidifies my theory, because Noelle obviously saw something worthwhile to signal to her partner Pat. That and the presence of the dangling object pretty much debunks the Jedediah Smith pics. Also, I think I saw a beige edge of the half pendant Noelle was signaling with 1:26 left in the run right before the camera angle changes to Noelle lining up with the left painting. If anybody can get a pic of this reflection I saw please post it.
Also, I think Pat missed the half pendant because the room was blacked out, so he couldn't see well enough to find it.