So several players have told me they’ve lost their amulet in the green corridor.
If this happens to you, it’s most likely not a bug. Go to room 14 and look at the “laser table” to the left. It will most likely be resting there.
If this happens to you in the 4th corridor, it might be resting on the “laser table” in room 23, also on the left.
Hope it helps!