Splitting arrow stacks into container in backpack causes arrow pile source to become stuck/unclickable

[hgesler]

1. Equip a stack of arrows
2. Place a stack of same arrows in a container in backpack
3. Split the equipped arrow stack into the stack in the container.
4. The arrows in the container (the destination pile) become "stuck" player cannot move them etc.

I am sure this is what causes arrows in guild vaults to become stuck as well.