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Comments on How to fix corrupted world data after increasing the world height with a datapack?
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How to fix corrupted world data after increasing the world height with a datapack? Question
I increased the vertical height of my world yet again by lowering the min_y and increasing the height values in the existing datapack I've already used for 2 years, whose sole purpose is to provide me more vertical space for building. Unfortunately, after doing so, my world started exhibiting some issues. It renders just fine in vanilla, but some of the mods I use were struggling with the chunk rendering. I assumed it was a bug in the mods, so I kept on building. Only now I realized that maps are broken too, meaning my vanilla world data is likely corrupted. Unfortunately, I have now spent quite some time expanding the world further, so reverting to the backup is not really an option.
What has gone wrong here, and how do I fix it?
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I do not know why this happened, but I did figure out a solution which seems like it permanently solves it.
Whenever a block is placed in the world, the chunk updates such that the y level of that block is now considered the tallest point at that [x, z] coordinate, for maps and mods reading the height. Therefore, all that is necessary, is to cover the entire existing world with a temporary roof.
It's easiest to either use WorldEdit or the /fill command to place and remove that roof above all the chunks.
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