chunks messed up

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random chunks messed up like flat sides and nether roof dropped down

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i think its because i was uploading data packs on existing worlds

but i still dont know how to create fresh worlds with data packs in nether/end

[dreamy surge]

Adding Worldgen Packs to Existing Worlds

Generally, it isn't recommended to add worldgen packs to existing worlds as blending isn't enabled. If you still wish to anyways, you have a few options:

Option 1

Reset the dimension you are trying to add a worldgen pack for.

• Deleting the Overworld is not recommended for obvious reasons, but if you want to anyways delete the region folder in regular worlds and world/region on Paper/Spigot-like servers.
• Deleting the Nether requires deleting the DIM-1 folder in regular worlds and world_the_nether/region on Paper/Spigot-like servers.
• Deleting the End requires deleting the DIM1 folder in regular worlds and world_the_end/region on Paper/Spigot-like servers.

Option 2

Use a program like MCA Selector to forcefully enable blending on an existing world. Use this option at your own risk, no one will provide support for it in this server!

Option 3

Install the worldgen datapack, then deal with very nasty chunk borders. Basically Option 2, but without doing anything.

[floral quail]

Apologies for a very late response. Since it has been so long since the issue was created, I will close the thread for now. If it is still a problem, feel free to open a new one.