When you have for example a shovel in your hand, and you want to open or close a door while switching to another item in your hotbar, your current melee weapon will get stuck in your hands. You can still use it for both fighting and crafting but can't take any other item into your hands until you relog.
Steps to reproduce:
1. Take melee weapon in hand (eg.: shovel)
2. Go to a door
3. Switch to another item using your hotbar, while your character is doing the animation for opening/closing the door.
I tried everything to get the item unstuck but the only thing that seemed to work was a relog.