The bug
When barrels containing items are broken, they drop without dropping their items.
How to reproduce
Place a barrel
Place a hopper on top of the barrel
Place items in the hopper
→ ✔ The items will be transferred to the barrelBreak the barrel with an axe
→ ❌ The barrel will drop, the items are lost
The functionality of the barrel has not been fully implemented yet, thats why they don't drop items when broken at the moment.