With the release of New Light back on October 1st, many of the original Campaign rewards for the Legacy Y1 and Y2 campaigns were adjusted or retired. The Memory of Cayde Cloak is one such guaranteed reward that was retired. It was a guaranteed reward previously as well as a random drop. So, the only bug concerning that one is that the Collections entry still shows that it's still available directly from the Campaign (There are several others as well that haven't had their text updated yet). You can receive the Memory of Cayde as a random drop. If I remember right, the main ones are the Barons, so you can do the repeatable Story Missions tied to Forsaken to give you another chance at them. In addition to the ones that already had Random availability through drops, all of the other retired campaign rewards will now drop randomly through gameplay, they weren't removed from the game entirely.