: Renamed block entities (like Chests or Shulker Boxes) are also affected, meaning you cannot stack renamed storage containers.
: A hidden value that increases the experience cost of future anvil uses. 125046
In some versions, the Grindstone may still leave a RepairCost: 0 tag, which might still cause stacking issues with "clean" items. 3. Mass Renaming If you want a stack of renamed items to stay together: Rename the at once in the anvil. : Renamed block entities (like Chests or Shulker
Even if two items have the same custom name, they might have different RepairCost values if one was used in an anvil more times than the other. 2. Using the Grindstone Setting up that handle renamed items
The bug occurs because the game applies a RepairCost tag even if the item hasn't been repaired, just renamed. Since the game only stacks items with identical NBT data, a renamed item (with RepairCost: 0 or higher) will not stack with a standard item (which has no tag at all). How to Manage Renamed Items
In Minecraft, items of the same type (like Diamonds or Cobblestone) are expected to stack up to 64. However, the game tracks specific metadata called data. When you rename an item in an anvil, the game adds two pieces of data: display.Name : The new custom name.
Setting up that handle renamed items