At the post messages when you go to the tower and you go to Kadi 55-30 for your stuff and when you put a locked on your item that you want to keep, while you leave the tower to do more actives and you get more reward either weapons or armor pieces some of your stuff you had at the post messages that hold 21 some of your stuff that is locked instead of it goes to your vault if you had more space. It just disappears instead it is going to your vault; it happens to me on my Xbox series X console while I am playing destiny 2 and I have some weapons and armor pieces in my post messages save for me to go back and looked at them later after I finish the actives and the one, I had put a locked on in my post messages of 5 weapons and one weapon holofoil it did not go into my vault when you get more reward and weapons and or armor pieces to move out of your post messages for the other reward in your post messages, instead it just disappear completely it being in your vault space.