You know how whenever you get wiped in the Vault of Glass when fighting Atheon and your Super goes all the way down? Well I had some small experience progress on one of the upgrades on the Vex Mythoclast, then after getting wiped so many times from the Oracles or losing the Relic (On Hard) I noticed that the experience for the weapon upgrade was gone. I'm not sure if this is really a bug or I just THOUGHT I saw some experience and it was later gone, not really that big of a bug but if it gets fixed that would be a nice small little thing to get off the bug pile. [Testing may need to be done for it to be sure.]