The bug
Before 21w06a, the world limit was 256 blocks. Now, it is 384 blocks. However, the superflat preset selector does not allow for creation of a world with over 256 layers, as the previous limits have not been changed.
Linked issues
is duplicated by 2
relates to 2
Comments 4
Hi!
You can do this by modifying the "worldgen_settings_export.json". Probably this functionality will be added to gui soon.
[media]
Hello @unknown! I believe that you may be misunderstanding the issue. This is not about not being able to use a custom world height, but rather not being able to use over 256 layers. In the settings file you've provided, you only use four layers (1 bedrock, 2 dirt, 1 grass block). Currently, setting these higher than 256 crashes the game when trying to import these, so right now, this is impossible.
Note that supporting customized world heights on superflat worlds requires additional work and may not happen for 1.17.