So I was working on a gambit memento on my IKELOS hand cannon last season and set it aside when Lightfall came out. When I came back to it tonight, I found that it is gone from the weapon, despite still showing up on DIM (Destiny Item Manager)! As far as I know, these don't have any sort of expiration on them and I'm just confused as to if this is a bug or intended? I really wanted to finish that thing out.