mojira.dev
MC-112131

Intersecting dungeons: spawner replaced by cobblestone

How to reproduce

  1. Create a customized world with the seed

    3097946827751441825

    and default settings except dungeon count which should be 100

  2. Use the following teleport command

    /tp @s -2611.29 32.13 3316.08 296.21 20.59

Code analysis

Based on 1.11 decompiled using MCP 9.35 rc1

The method net.minecraft.world.gen.feature.WorldGenDungeons.generate(World, Random, BlockPos) only makes sure that it does not replace chests, but does not test for mob spawners.

Linked issues

Attachments

Comments

[Mod] Neko

Does this occur without the world download but with the same seed?

Lukas Korosec

Yes, the same bug occurs also with the same seed with a freshly generated world in Minecraft 1.9.4, without world download, using Dungeon Count 100.

Like I said, the world download includes non-default world generation options. With default world generation settings, there is no double dungeon at this location.

Jack Cusack

I managed to reproduce this on 1.13.2.
Seed: 3097946827751441825
Double dungeon XYZ: -2607 31 3319

Observe that the second spawner has been replaced with cobblestone.

Important note: this dungeon does not generate as a double dungeon if you directly /tp to the coordinates. I can verify the double dungeon spawns on a fresh world when teleporting to -2572 31 3275 and then moving to the dungeon coordinates specified above.  There seems to be a quirk where teleporting directly into the ungenerated chunk can influence the dungeon generation.

KingSheepMC
[media]

Found one broken spawner in 20w22a from a stronghold. It looks like this should be reopened.

marcono1234

@@unknown, since this involves a stronghold it might be a separate (but related) issue. Could you please create a separate report and provide seed, coordinates and (if necessary) world generation options in text form there?

KingSheepMC

Yeah I’ll create a separate ticket for a different dungeon bug.

KingSheepMC

I made a ticket MC-190568 for the stronghold destroying the spawner.

pine1needle

This bug was either not actually fixed in 20w22a, or else it was reintroduced in a later version. Please see MC-199953 for a seed and coordinates that reproduce this bug in 1.16.3.

Lukas Korosec

coschevi

Confirmed

Structures, World generation

cobblestone, dungeon, mob-spawner, spawner, world-generation

Minecraft 1.11.2, Minecraft 1.12.1, Minecraft 1.12.2, Minecraft 17w43a, Minecraft 17w43b, Minecraft 1.13.2, Minecraft 19w04b, Minecraft 19w05a

20w22a

Retrieved