Trees generating in the ground or not at all
In 18w20b, trees are generating in the ground or not at all. The biome is shown in the screenshot. Affects forest, swamp, roofed forest, taiga, jungle, etc. Either it does not affect extreme hills with trees, or trees randomly decide to generate. But when I am flying by trees that generate there is extreme generation lag. This also appears to affect underwater plants like kelp and sea grass.
The specific seed is: -6400733238810633415
Linked Issues
discovered while testing1
Created Issue:
Trees generating in the ground or not at all.
In 18w20b, trees are generating in the ground or not at all. This biome is supposed to be a forest.
The specific seed is: -6400733238810633415
In 18w20b, trees are generating in the ground or not at all. Th
isbiome is supposed to be aforest.
The specific seed is: -6400733238810633415
In 18w20b, trees are generating in the ground or not at all. The biome is shown in the screenshot. Affects forest, swamp, roofed forest, etc.
The specific seed is: -6400733238810633415
In 18w20b, trees are generating in the ground or not at all. The biome is shown in the screenshot. Affects forest, swamp, roofed forest, taiga, etc.
Either it does not affect extreme hills with trees, or trees randomly decide to generate. But when I am flying by trees that generate there is extreme generation lag.
The specific seed is: -6400733238810633415
In 18w20b, trees are generating in the ground or not at all. The biome is shown in the screenshot. Affects forest, swamp, roofed forest, taiga, etc.
Either it does not affect extreme hills with trees, or trees randomly decide to generate. But when I am flying by trees that generate there is extreme generation lag.
This also appears to affect underwater plants like kelp and sea grass.
The specific seed is: -6400733238810633415
In 18w20b, trees are generating in the ground or not at all. The biome is shown in the screenshot. Affects forest, swamp, roofed forest, taiga, jungle, etc.
Either it does not affect extreme hills with trees, or trees randomly decide to generate. But when I am flying by trees that generate there is extreme generation lag.
This also appears to affect underwater plants like kelp and sea grass.
The specific seed is: -6400733238810633415
is duplicated by
discovered while testing
is duplicated by
In 18w20b, trees are generating in the ground or not at all. The biome is shown in the screenshot. Affects forest, swamp, roofed forest, taiga, jungle, etc.
Either it does not affect extreme hills with trees, or trees randomly decide to generate. But when I am flying by trees that generate there is extreme generation lag.
This also appears to affect underwater plants like kelp and sea grass.
The specific seed is: -6400733238810633415
In 18w20b, trees are generating in the ground or not at all. The biome is shown in the screenshot. Affects forest, swamp, roofed forest, taiga, jungle, etc. Either it does not affect extreme hills with trees, or trees randomly decide to generate. But when I am flying by trees that generate there is extreme generation lag. This also appears to affect underwater plants like kelp and sea grass.
The specific seed is: -6400733238810633415
Trees generating in the ground or not at all.
is duplicated by
is duplicated by
is duplicated by
The bug
I found out a bug when generating trees (MC-129738, already reported by someone) and to check, if there are any errors in the logs, I found out that some ruin structure files are missing.
Log info:

In text form:
[20:21:31] [WorldGen-Worker-16/ERROR]: Couldn't load structure minecraft:ruin/big_brick_1: java.io.FileNotFoundException: minecraft:structures/ruin/big_brick_1.nbt [20:21:31] [WorldGen-Worker-16/ERROR]: Couldn't load structure minecraft:ruin/big_cracked_1: java.io.FileNotFoundException: minecraft:structures/ruin/big_cracked_1.nbt [20:21:31] [WorldGen-Worker-16/ERROR]: Couldn't load structure minecraft:ruin/big_mossy_1: java.io.FileNotFoundException: minecraft:structures/ruin/big_mossy_1.nbt
If you need a seed for recreation, it's 4566936303172969989.
I believe that this is a dupe of MC-129738.
Duplicate of MC-129738

















Had the same bug, really annoying!
I noticed the same thing. There also appears to be small random patches of forest that generate normally for some reason.
Seed for pictures: -1165132418
I added some pictures showing the effect of the glitch on roofed forests and flower forests which seem to have been hit pretty hard by this bug.
Confirmed, happens same for seed 4566936303172969989, coords -400 ~ -500:

It seems to affect all types of chunk population including snow layers
Confirmed, Seed -106396336, coords 50 100 50
1.12.2:
18w20b:
This bug needs to be reopened. It has returned in 18w22a (or it still occurs on rare occasions).
Seed: -6854186799080392367
Coords: -250, 330
That's a different bug:
MC-125807