There are many occasions where there is this bug I would put any item(s) into my inventory and they would disappear. Sometimes exiting the game and rejoining the game will make the item reappear in your inventory. Sometimes the item will drop into a loot bag upon re-entering the server and it will disappear forever.
This is outrageously annoying. Imagine putting thousands of valuable crafting items into your inventory only to find out they all disappeared. Yea there goes your time.