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Migrating a pregenerated "end dimension" from singleplayer to paper server

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West African Crocodile posted this in #questions
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West African CrocodileOP
I pregenerated the End dimension in 1.21.6 singleplayer using C2ME + Chunky (Fabric). Now I’m trying to use that world on a Paper 1.21.6 server.

I copied the pregenerated DIM1/ folder into ./world_the_end/DIM1/ on the server.

But now I’m getting spammed with this in console:

[ChunkLoadTask] Failed to parse chunk data ... chunk data will be lost java.lang.ArrayIndexOutOfBoundsException: Index 16 out of bounds for length 16 at net.minecraft.world.level.chunk.ChunkAccess.getOrCreateOffsetList(ChunkAccess.java:464)

I already tried:

- Wiping world_the_end and letting Paper generate fresh level.dat, etc.
- Only keeping DIM1 folder
- Replacing entire world_the_end with pregenerated one
- Confirmed it's the End dimension only – Overworld/Nether load fine

Still getting the same crash spam on boot.
West African CrocodileOP
Update:
Turns out the issue was caused by worldgen datapacks I used when pregenerating the world. I forgot to include them on the server side, which made paper freak out while loading chunks in the end.
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