If you have a gun in your hands which can be equipped on the shoulder slot e.g. AKM, M4, Mosin, BK-18 and you press A to move an item from either your inventory or vicinity to hands slot, the item will NOT go to your hands and the weapon will stay in your hands.
Previously the weapon would move to your shoulder automatically if there is no space within any of your inventory slots.
Have a large weapon in your hands which can be equipped on your shoulder slot.
Press A on any item to attempt to put it in your hands
You will notice nothing happens unless there is space for the gun to go in your backpack.
(The gun is supposed go to your shoulder and allow the item your pressed A on to go in your hands.)
Of course I am aware that you can just press X to equip the weapon before picking up the item but I thought I'd share this change as it may be unintended.