stone knife gets stuck in inventory slot and/or hands. When in hands cannot return to inventory by using hotkey or X but will return if another hotkey item is clicked. Once when trying to remove stuck knife from inventory by drag and drop it worked but another item instantly appeared in the slot it was in - seemed like they were stacked.

I've checked always from the menu because I crafted 3 knifes and it happened with all - they worked as normal for a few uses then malfunctioned.