Structure blocks loads 9 ender dragons when only one is saved
The Bug:
When saving ender dragons with structure blocks, ender dragons are saved nine times, which causes the ender dragon to be duplicated.
Steps to Reproduce:
- Download the provided structure block .nbt file that contains an empty structure that has one ender dragon within it. mc-257728.nbt

- Create a world and place the .nbt file into the generated\minecraft\structures folder.
- Place down a structure block with the appropriate data already inputted into it by using the command provided below.
/setblock ~1 ~ ~1 minecraft:structure_block{ignoreEntities:0b,mode:"LOAD",name:"minecraft:mc-257728",posX:1,posY:0,posZ:1,powered:0b,showboundingbox:1b,sizeX:29,sizeY:13,sizeZ:29} - Open the structure block and click the "LOAD" button to load the structure.
- Take note as to whether or not structure blocks load 9 ender dragons despite only one being saved.
Observed Behavior:
Structure blocks load 9 ender dragons despite only one being saved.
Expected Behavior:
Structure blocks would load one ender dragon if only one has been saved.
Linked Issues
Created Issue:
Structure block saves ender dragon 9 times
When save ender dragon with structure block, ender dragons are saved 9 times, which causes the dragon duplicated.
relates to
When save ender dragon with structure block, ender dragons are saved 9 times, which causes the dragon duplicated.The Bug:
When saving ender dragons with structure blocks, ender dragons are saved nine times, which causes the ender dragon to be duplicated.
Steps to Reproduce:
- Download the provided structure block .nbt file that contains an empty structure that has one ender dragon within it. mc-257728.nbt
- Create a world and place the .nbt file into the generated\minecraft\structures folder.
- Place down a structure block with the appropriate data already inputted into it by using the command provided below.
/setblock ~1 ~ ~1 minecraft:structure_block{ignoreEntities:0b,mode:"LOAD",name:"minecraft:mc-257728",posX:1,posY:0,posZ:1,powered:0b,showboundingbox:1b,sizeX:29,sizeY:13,sizeZ:29}
- Open the structure block and click the "LOAD" button to load the structure.
- Take note as to whether or not structure blocks save ender dragons nine times.
Observed Behavior:
Ender dragons are saved nine times.
Expected Behavior:
Ender dragons would only be saved once.
Structure block savesender dragon9timesStructure blocks save ender dragons nine times
Structure blockssaveender dragonsnine timesStructure blocks loads 9 ender dragons when only one is saved
The Bug:
When saving ender dragons with structure blocks, ender dragons are saved nine times, which causes the ender dragon to be duplicated.
Steps to Reproduce:
- Download the provided structure block .nbt file that contains an empty structure that has one ender dragon within it. mc-257728.nbt
- Create a world and place the .nbt file into the generated\minecraft\structures folder.
- Place down a structure block with the appropriate data already inputted into it by using the command provided below.
/setblock ~1 ~ ~1 minecraft:structure_block{ignoreEntities:0b,mode:"LOAD",name:"minecraft:mc-257728",posX:1,posY:0,posZ:1,powered:0b,showboundingbox:1b,sizeX:29,sizeY:13,sizeZ:29}
- Open the structure block and click the "LOAD" button to load the structure.
- Take note as to whether or not structure blocks
saveender dragonsnine times.Observed Behavior:
Ender dragons are saved nine times.Expected Behavior:
Ender dragons would only besavedonce.The Bug:
When saving ender dragons with structure blocks, ender dragons are saved nine times, which causes the ender dragon to be duplicated.
Steps to Reproduce:
- Download the provided structure block .nbt file that contains an empty structure that has one ender dragon within it. mc-257728.nbt
- Create a world and place the .nbt file into the generated\minecraft\structures folder.
- Place down a structure block with the appropriate data already inputted into it by using the command provided below.
/setblock ~1 ~ ~1 minecraft:structure_block{ignoreEntities:0b,mode:"LOAD",name:"minecraft:mc-257728",posX:1,posY:0,posZ:1,powered:0b,showboundingbox:1b,sizeX:29,sizeY:13,sizeZ:29}- Open the structure block and click the "LOAD" button to load the structure.
- Take note as to whether or not structure blocks load 9 ender dragons despite only one being saved.
Observed Behavior:
Structure blocks load 9 ender dragons despite only one being saved.
Expected Behavior:
Structure blocks would load one ender dragon if only one has been saved.

Relates to
MC-146503.Updated this ticket for ease of reproducing.
Can confirm in 1.20.4 and 23w51b
Although
MC-146503has been resolved, I am still able to replicate this issue in 24w12a.