Steps to Reproduce:
Obtain two banners of the same type
Switch to Survival mode
Place one banner
Break it and pick it up
Try to stack the banners
Observed Results:
The banners can no longer be stacked with each other.
Expected Results:
The banners should stack with each other.
Original Description:
Sometimes banners don't stack. I presume it has something to do with the block state age (I'm thinking like the cactus in MCPE-42497) because only if all banners have never been placed in the world or have been placed and recently broken can they be stacked.
(And of course the banners have to be of the same color, design, etc.)
Also, if a banner is named and placed in the world then the name disappears when it is broken.
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To add a bit of detail, if you start with several banners of the same kind and then place, beak and pick up some of them, then all of the placed and broken banners will stack with each other, but they will not stack with the never-placed banners.
Also, if you do these steps
/give @s banner
/setblock ~ ~ ~ standing_banner
Mine the standing banner OR break it with a piston.
You'll have 2 black banners that do not stack. I think this means that it is specifically the mining/breaking or not that makes otherwise identical banners not stackable, because when using commands there is no crafting or block placement done by the player.
This also occurs when using /setblock to place a wall banner or standing banner in a position where it breaks immediately.
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Affects 1.11.4 and 1.12.0.