Some backpack problems:
An issue that stays from DOS1 is that sometimes the scrolling bar disappears. Then the backpack must be closed and reopened to get the bar back.
A new issue is that when crafting items inside a backpack, they are not visible when opening the backpack. I tried to make some potions and this happened. Then, when I re-entered the crafting screen, the potions were there. I had to re-order items in the crafting screen to make the potions visible when opening the backpack. I have the impression, but I am not sure, that this may happen if the crafted item is the last item in the crafting screen.