1.16 has grass blocks of villages that haven't been loaded fully in 1.15 replaced with air blocks

Please provide the seed and coordinates.

Seed: 8248636971429582463

Coordinates: -800 ~ -1728

I generated three new villages on this map and they all had this problem.

I continue to be unable to reproduce this, please try to generate the world with absolutely no mods installed.

Steps to reproduce:

1. Create a world in 1.15.2,

2. Locate a village,

3. Travel in that direction. Once you see the village, save and quit to title.

4. Load your world in 1.16 and generate the complete village.

I couldn't reproduce it by just creating a 1.15.2 world and loading it in 1.16 so I guess you have to load some of the village's chunks in 1.15.2 and some in 1.16 for this bug to happen.

That's very specific so I guess I will just load the chunks around my villages before opening my world in 1.16.

Can confirm. See screenshots and explanation below. Note that in each screenshot the seed (obviously), and the coordinates are exactly the same.

: shows the world/village generated fully in 1.15.2

: shows the world/village partly generated in 1.15.2; moving to the village has been interrupted as soon as the first few bits of the village have appeared. 1.15.2 has been save-quitted immediately after. World has then been opened in 1.16.1 and the remaining chunks of the village have been loaded completely in said version.

: irrelevant screenshot, just for reference: the world/village generated fully in 1.16.1

When the 1.15.2 world has been opened in 1.16.1, the following errors have been thrown (showing only a few snippets of

):

[16:05:44] [Server thread/INFO]: censored joined the game
[16:05:45] [Render thread/INFO]: Loaded 0 advancements
[16:05:49] [Render thread/WARN]: Received passengers for unknown entity
[16:05:53] [Server thread/ERROR]: No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:dirt"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_block"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:always_true"},output_state:{Properties:{snowy:"false"},Name:"minecraft:grass_block"},input_predicate:{predicate_type:"minecraft:random_block_match",probability:0.2f,block:"minecraft:grass_path"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Name:"minecraft:acacia_planks"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_path"}}]
[16:05:53] [Server thread/ERROR]: No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:dirt"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_block"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:always_true"},output_state:{Properties:{snowy:"false"},Name:"minecraft:grass_block"},input_predicate:{predicate_type:"minecraft:random_block_match",probability:0.2f,block:"minecraft:grass_path"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Name:"minecraft:acacia_planks"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_path"}}]
[16:05:53] [Server thread/ERROR]: No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:dirt"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_block"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:always_true"},output_state:{Properties:{snowy:"false"},Name:"minecraft:grass_block"},input_predicate:{predicate_type:"minecraft:random_block_match",probability:0.2f,block:"minecraft:grass_path"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Name:"minecraft:acacia_planks"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_path"}}]
[16:05:53] [Server thread/ERROR]: No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:dirt"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_block"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:always_true"},output_state:{Properties:{snowy:"false"},Name:"minecraft:grass_block"},input_predicate:{predicate_type:"minecraft:random_block_match",probability:0.2f,block:"minecraft:grass_path"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Name:"minecraft:acacia_planks"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_path"}}]
[16:05:53] [Server thread/ERROR]: No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:dirt"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_block"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:always_true"},output_state:{Properties:{snowy:"false"},Name:"minecraft:grass_block"},input_predicate:{predicate_type:"minecraft:random_block_match",probability:0.2f,block:"minecraft:grass_path"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Name:"minecraft:acacia_planks"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_path"}}]
[16:05:53] [Server thread/ERROR]: No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:dirt"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_block"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:always_true"},output_state:{Properties:{snowy:"false"},Name:"minecraft:grass_block"},input_predicate:{predicate_type:"minecraft:random_block_match",probability:0.2f,block:"minecraft:grass_path"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Name:"minecraft:acacia_planks"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_path"}}]
[16:05:53] [Server thread/ERROR]: No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:always_true"},output_state:{Properties:{age:"0"},Name:"minecraft:melon_stem"},input_predicate:{predicate_type:"minecraft:random_block_match",probability:0.1f,block:"minecraft:wheat"}}]
[16:05:53] [Server thread/ERROR]: No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:dirt"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_block"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:always_true"},output_state:{Properties:{snowy:"false"},Name:"minecraft:grass_block"},input_predicate:{predicate_type:"minecraft:random_block_match",probability:0.2f,block:"minecraft:grass_path"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Name:"minecraft:acacia_planks"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_path"}}]
[16:05:53] [Server thread/ERROR]: No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:dirt"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_block"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:always_true"},output_state:{Properties:{snowy:"false"},Name:"minecraft:grass_block"},input_predicate:{predicate_type:"minecraft:random_block_match",probability:0.2f,block:"minecraft:grass_path"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Name:"minecraft:acacia_planks"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_path"}}]
[16:05:53] [Server thread/ERROR]: No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:dirt"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_block"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:always_true"},output_state:{Properties:{snowy:"false"},Name:"minecraft:grass_block"},input_predicate:{predicate_type:"minecraft:random_block_match",probability:0.2f,block:"minecraft:grass_path"}}];  No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Name:"minecraft:acacia_planks"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_path"}}]
[16:05:53] [Server thread/ERROR]: No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:dirt"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_block"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:always_true"},output_state:{Properties:{snowy:"false"},Name:"minecraft:grass_block"},input_predicate:{predicate_type:"minecraft:random_block_match",probability:0.2f,block:"minecraft:grass_path"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Name:"minecraft:acacia_planks"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_path"}}]
[16:05:53] [Server thread/ERROR]: No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:dirt"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_block"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:always_true"},output_state:{Properties:{snowy:"false"},Name:"minecraft:grass_block"},input_predicate:{predicate_type:"minecraft:random_block_match",probability:0.2f,block:"minecraft:grass_path"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Name:"minecraft:acacia_planks"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_path"}}]
[16:05:53] [Server thread/ERROR]: No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:dirt"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_block"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:always_true"},output_state:{Properties:{snowy:"false"},Name:"minecraft:grass_block"},input_predicate:{predicate_type:"minecraft:random_block_match",probability:0.2f,block:"minecraft:grass_path"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Name:"minecraft:acacia_planks"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_path"}}]
[16:05:53] [Server thread/ERROR]: No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:dirt"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_block"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:always_true"},output_state:{Properties:{snowy:"false"},Name:"minecraft:grass_block"},input_predicate:{predicate_type:"minecraft:random_block_match",probability:0.1f,block:"minecraft:grass_path"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Name:"minecraft:oak_planks"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_path"}}]
[16:05:53] [Server thread/ERROR]: No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:always_true"},output_state:{Properties:{age:"0"},Name:"minecraft:melon_stem"},input_predicate:{predicate_type:"minecraft:random_block_match",probability:0.1f,block:"minecraft:wheat"}}]
[16:05:53] [Server thread/ERROR]: No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:dirt"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_block"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:always_true"},output_state:{Properties:{snowy:"false"},Name:"minecraft:grass_block"},input_predicate:{predicate_type:"minecraft:random_block_match",probability:0.2f,block:"minecraft:grass_path"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Name:"minecraft:acacia_planks"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_path"}}]
[16:05:53] [Server thread/ERROR]: No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:dirt"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_block"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:always_true"},output_state:{Properties:{snowy:"false"},Name:"minecraft:grass_block"},input_predicate:{predicate_type:"minecraft:random_block_match",probability:0.2f,block:"minecraft:grass_path"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Name:"minecraft:acacia_planks"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_path"}}]
[16:05:53] [Server thread/ERROR]: No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:dirt"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:water"},output_state:{Properties:{level:"0"},Name:"minecraft:water"},input_predicate:{predicate_type:"minecraft:block_match",block:"minecraft:grass_block"}}]; No key position_predicate in MapLike[{location_predicate:{predicate_type:"minecraft:always_true"},output_state:{Properties:{snowy:"false"},Name:"minecraft:grass_block"},input_predicate:{predicate_type:"minecraft:random_block_match",probability:0.2f,block:"minecraft:grass_path"}}];

It should be checked if this affects other structures or blocks as well.

Same error message as in console spam report MC-191388, could be useful.

I'm not very knowledgeable about how Minecraft generates, but it does seem to affect other blocks:

@nighter Why is this (which is a same issue as MC-191388  ) marked Won't Fix?