Mangled hand prevents stone throwing [3.71]

[PALU]

I created a character who'd been injured by Njerps and left for dead (starting scenario), leading to a mangled left hand. I found a rock and equipped it in the available hand, noticing that a second rock couldn't be equipped (as expected). When encountering a bird I tried to throw the equipped rock at it, but received the message that I couldn't use the left hand for throwing, which doesn't make sense as the rock ought to have been equipped in the working hand. I then tried the unequipped rock and was met with the same message (which is otherwise reasonable, as the working hand ought to be occupied by the equipped rock). After unequipping the equipped rock I could throw a rock, but I wasn't prepared to accept that unreasonable additional difficulty of having thrown rocks take twice as long to throw, so I just ditched the character and created a new one. Unfortunately, this means I don't have a save with which to demonstrate the issue.