I booted up my game after the update to find I now have hand-slots. Nice! However, I noticed that doing this:
- Opening inventory
- removing the Xeno-basher and leaving the hand-slots blank
- Closing the inventory
This left the xeno-basher equipped.
- After leaving the slots blank, I re-opened the inventory
- equipped the chansaw to the first slot
- closed the inventory
- This left the xeno-basher equipped. Could not scroll to Chainsaw
Then I re-equipped the xeno-basher and from there the hand slots worked as expected. Maybe the glitch concerns only the one item you're holding when booting the update...