Mojira Archive
MC-76977

Dragon egg can teleport outside the world

The bug

Right clicking a dragon egg near y = 0 or y = 255 can result in it being deleted.

How to reproduce

  1. Create a Superflat world completely filled with a block
    3;256*minecraft:stone;127;
    
  2. Replace one block at y = 255 and place a dragon egg
  3. Right click the dragon egg

Code analysis

Based on 1.11.2 decompiled using MCP 9.35 rc1

The method net.minecraft.block.BlockDragonEgg.teleport(World, BlockPos) does not test if the y-coordinate of the randomly chosen position is inside the valid building height range. Since the method World.getBlockState(BlockPos) returns for positions < 0 and >= 256 air the dragon egg tries to place itself there.

Note: It would be great if the dragon egg would not try to teleport outside the worldborder or at least the 30,000,000 blocks area as well.

Unresolved

KingSupernova

2015-01-27, 09:31 AM

2024-05-17, 11:12 PM

9

6

Confirmed

(Unassigned)

dragon_egg, teleport

Minecraft 1.8.2-pre4 - 24w20aMinecraft 1.8.2-pre4, Minecraft 1.11.2, Minecraft 1.12 Pre-Release 5, 1.15.2, 20w06a, 20w07a, 20w48a, 20w51a, 21w03a, 1.16.5, 21w05b, 21w06a, 21w07a, 21w08b, 24w20a

-