What I expected to happen was...:
while using workbench shift click from hotbar should transfer item up from hotbar to player inventory
What actually happened was...:
Shift click transferred items from hotbar to empty workbench slots similar to shift clicking in a chest. Also transferred from player inventory to workbench slots.
Steps to Reproduce:
Interact with workbench
Shift click item in player inventory
I think this might be working as intended.