[MC-140727] Decorations and terrain can generate inside of structures

The Bug:

Decorations and terrain can generate inside of structures.

Just for clarification reasons, decoration blocks are blocks such as grass, ferns, seagrass, etc...

Here are some examples:

Version: 1.21.4

Seed: -6533926018995126751
Coordinates: /execute in minecraft:overworld run tp @s 171 68 869

Steps to Reproduce:

Generate a world with any of the seeds provided above and teleport to the given coordinates.
Look closely at the terrain/decorations inside the said structure.
Take note as to whether or not decorations and terrain can generate inside of structures.

Observed Behavior:

Decorations and terrain can generate inside of structures.

Expected Behavior:

Decorations and terrain would not be able to generate inside of structures.

Linked issues

clones 1

MC-23830 Pre 1.14: Terrain inside villager hut Resolved

is duplicated by 25

MC-140966 village generation issues Resolved

MC-141250 Village Buildings Spawning in the ground and are filled with dirt Resolved

MC-143785 Odd terrain generation in Plains Village messing with elevation Resolved

MC-147381 Grass spawning in new village on wood floors. Resolved

MC-147455 grass where it shouldn't be in 1.14 village Resolved

20 more links

relates to 3

MC-263930 Top of some high woodland mansion rooms do not replace blocks with air Reopened

MC-160658 Taiga decoration element can generate inside houses Resolved

MC-139696 Decorations can generate on the ground inside of pillager outposts Open

Attachments

MC-140727.mp4

MC-140727 - Pillager Outpost Example.png

Screen Shot 2020-05-29 at 1.48.24 PM 5-29-20.png

Comments 32

marcono1234 2019-01-27T19:01:15Z

I reopened this report now to be about the new 1.14 villages only, while MC-23830 will be only about the old villages.
Please provide seeds and coordinates where this bug can be seen.

hamgaacaan 2019-01-28T01:37:08Z

@Marcono1234 https://www.bilibili.com/video/av37606008

gaspoweredpick 2019-04-07T08:42:40Z

Confirmed for 19w14b

No Thanks 2019-04-24T10:18:31Z

still happens in 1.14 307,73,334 SEED: 4878702018839826212

gaspoweredpick 2019-05-20T22:15:42Z

Confirmed for 1.14.1 and 1.14.2 Pre-Release 2

22 more comments

W_V 2020-03-08T06:48:05Z

Confirmed for 1.15.2 and 20w10a

owlfalls35 2020-05-29T22:19:45Z

Same here. I saw grass in a village house.

pulpetti 2020-07-16T19:39:50Z

In 1.16.1 and 20w29a

Avoma 2020-12-29T17:43:44Z

Can confirm that this is still an issue. I've attached a screenshot along with a seed and coordinates of this issue occurring.

Seed: -5436467103508185805
Coordinates: /execute in minecraft:overworld run tp @p 21310 69 279 180 -45

Avoma 2021-01-27T16:59:38Z

Can confirm in 21w03a.

Avoma 2021-02-10T14:39:11Z

Can confirm in 21w05b.

Brevort 2021-02-14T19:22:26Z

Grass and stone spawning on ceiling in a mansion, so confirmed for 1.16.5.

user-68c81 2021-04-07T15:02:52Z

This happens because some structures have void blocks inside them, which will keep whatever block was in that place. A lot of them were fixed.

Ideally, there would be an exact list of the structures that have this issue, but that is a lot of work. Structures would need to be manually generated completely submerged in a flat world, to make sure they properly remove the terrain inside.

Brevort 2021-05-16T17:06:12Z

Does this stretch to include tall grass without dirt or grass under it?

user-c84db 2021-05-21T20:51:57Z

This can be easily reproduced by finding taiga_medium_house_1 or desert_toolsmith_1 in a naturally generated village.

ampolive 2021-09-22T22:24:10Z

This also affects flowers; can confirm in 1.17.1 and 21w37a.

Avoma 2021-11-15T10:39:22Z

Can confirm in 1.18 Pre-release 1.

[media][media]

Version: 1.18 Pre-release 1
Seed: -4534856491544025661
Coordinates: /execute in minecraft:overworld run tp @s 29243.48 67.00 130.36 -396.48 -14.48

user-f2760 2021-12-09T10:16:17Z

The image 2021-02-14_14.22.03.png actually showcases MC-107594, which has a very different cause.
I'd still link them as related though, as it may look like the same bug to the end user.

KirbAvion 2022-02-17T04:35:28Z

Can confirm for 22w07a.

windwend 2022-03-23T19:25:39Z

Can confirm in 22w11a. This is interesting, so I revisited the two locations shown in two earlier screenshots, and the grass on the floor seems to be no longer present, but the dirt block inside the house generates as a grass block instead. I set randomTickSpeed to be 0, so the grass block should never change into dirt. I think it's possible that in Avoma's image, the dirt block generated as a grass block, but converted to dirt due to his randomTickSpeed not being 0. Overall, it seems that this bug is "partially fixed", potentially fixed for grass, but not for terrain.

Jon1337 2022-04-14T23:12:00Z

In 22w15a

Austminer 2022-06-26T00:00:56Z

This can also happen with leaves from trees generating inside of village houses, such as in 1.19 on seed 6325859001 at the coordinates of -1476, 95, -1960.

Avoma 2022-07-26T13:13:13Z

Can also confirm in 1.19; I found an example of this issue occurring with pillager outposts.

[media]

Version: 1.19

Seed: 4373241205666815302
Coordinates: /execute in minecraft:overworld run tp @s -1291.42 102.00 -80357.28 610.24 7.06

cmhcoder 2022-07-27T17:58:11Z

1.19

seed:2275652456192416646

676 48 4272

random stone block in shipwreck

[media]

user-f2760 2022-07-27T19:38:29Z

Shipwrecks have specific block spaces (mainly outside) set to void, so it keeps the old blocks. This is very different from what's described in this report.
Please create a separate issue for that, as that is a structure specific issue.

Some_One_YT 2022-12-20T19:43:35Z

can confirm in 1.19, 1.19.1, 1.19.2, 1.19.3

Brain81505 2023-01-20T16:14:39Z

Can confirm in 23w03a
Seed: 8587948038190963789
XYZ: -7987 97 1903
World type: Default
Image:

[media]

Avoma 2023-01-20T16:42:11Z

I've removed the part from this ticket about leaves from trees generating directly in front of village structures as that problem is tracked separately at MC-190031.

muzikbike 2024-02-10T20:55:16Z

Relates to MC-107594 and MC-263930?

MissLauralot 2024-12-03T18:52:56Z

Can confirm in 1.21.4

Seed: -6533926018995126751

XYZ: -896 83 -1348

XYZ: 171 68 869

cff_0102 2024-12-08T01:08:00Z

Can confirm in 1.21.4

seed: 4902607015186956457

-278 68 123

a hay bale in village's house

[media]

The same seed

-255 71 80

There is a grass generated in the house, which is also the most common situation of this bug.

J Z 2025-01-11T20:22:16Z

Affects 25w02a with the new leaf litter block:
Seed: -1311658802960653969
Position: /execute in minecraft:overworld run tp @s -1086.71 74.86 3481.74 -32.70 50.55

[media]