After converting a 1.17.1 world to a 21w43a world, if a ocean monument is generated in the area where the old and new world generation smooth out, a large gap is generated around it.
In 1.17.1:
Set render distance to 12 chunks
Generate a world using seed
1011466919414022920Teleport using
/tp -30 100 224These coordinates are exactly 14 chunks away from the center of where the ocean monument is going to generate in 21w43a
Wait until all chunks around the player have been generated
In 21w43a:
Load the world just generated in 1.17.1 (or download and load
)
Teleport using
/tp -256 64 224A new ocean monument will be generated at the exact area where the old and new world generation merges, leaving behind a large gap in and under the terrain
[media][media]
If we generate a new world in 21w43a using the same seed the ocean monument looks like this:
[media]Linked issues
is duplicated by 3
Attachments
Comments 2
May relate to MC-249144
I was able to reproduce this. I upgraded the provided 1.17.1 world to 1.18 pre-release 4. There are large flat walls (exactly along the chunk borders) where the old terrain meets the monument, and there is an overhang of land above the monument. This is related to MC-237145, but I believe it is a separate issue because MC-237145 is about monuments generated in new worlds in the 1.18 snapshots, and this report is about monuments along chunk borders in upgraded worlds.