Preventing Entity Deletion When Resolving Duplicate IDs

How Entity Clashes Are Handled

When duplicate entity IDs occur in standard Minecraft, the engine often rejects or deletes one of the conflicting objects to keep the internal database consistent. This can cause you to lose valuable named mobs, tamed pets, villager traders, dropped items, or vehicles like minecarts and boats.

Keeping Both Conflicting Entities

DEUF prevents entity loss entirely by replacing deletion with dynamic reassignment:

• Preserving Mobs: If two mobs share an ID—such as two villagers or farm animals created through duplicated region files—both remain standing in the world. Neither mob is despawned or purged.
• Protecting Vehicles and Items: Minecarts, boats, and loose item entities with matching identifiers are also caught and preserved rather than discarded.
• Assigning Fresh IDs: The mod grants a completely fresh, unique identifier to the duplicate entity.

No special blocks or items are added to your inventory to make this happen. You simply interact with your mobs and vehicles as normal, and both copies will continue to exist alongside each other safely.