What I thought would happen:
The pumpkins going in to the chest via the hopper would stack with the pumpkins on the bottom row of the chest
What actually happened: A new stack of pumpkins was created at the top of the chest
Linked issues
is duplicated by 6
MC-9875
Hopper Won't Fill Incomplete Stacks
Resolved
MC-13312
Hoppers sometimes creates new stacks in inventory blocks
Resolved
MC-21924
Items do not stack on the correct stack
Resolved
MC-34828
Hopper doesn't stack same items automatically
Resolved
MC-56731
Hoppers aren't attempting to stack items in chest connected to
Resolved
Attachments
Comments 9
To be clear, the issue is that hoppers do not replicate the behavior of shift+clicking stackable items in your inventory while viewing a chest with incomplete stacks of that same item.
Hoppers favor placing items in the earliest possible slot instead of the earliest slot with the same stackable item type when present.
This may be intended behavior.
Why does this work as intended? There is no comment here that says it. And everything else (shift-click, pick up, ...) stacks, so why not this?
Confirmed for 1.9.3-pre1 and pretty much all versions in between if anyone is interested.
Chest before hopper adds another pumpkin