Right clicking a dragon egg near y = 0 or y = 255 can result in it being deleted.
- Create a Superflat world completely filled with a block
- Replace one block at y = 255 and place a dragon egg
- Right click the dragon egg
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.