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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

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 125046

This ensures every item in that specific stack shares the exact same RepairCost and Name tags, allowing them to remain stacked. Impact on Automation The bug occurs because the game applies a

I can help you with more specific Minecraft technical guides, such as: Calculating anvil experience costs for high-level gear However, the game tracks specific metadata called data

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.