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MC-69150

Custom generation crashes game

Basically, when I made a custom generation world in 1.8 pre-1 and switched to 1.7.10, the game instantly closed. When I tried again, the game tried to load and crashed again.

What I expected to happen was...:
I would see my custom generation, and where the default 1.7.10 generation took over, I would see a sudden change in world generation.

What actually happened was...:
The game crashed.

Steps to Reproduce:
1. Make a custom generation world in 1.8 pre-1.
2. Explore around a bit, to load in some chunks.
3. Close the game and switch to 1.7.10
4. Open the custom world.
The game will crash upon loading.

Note: I cannot join any world after multiple attempts to restart the game. Don't replicate if at all possible.

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migrated

Dupe of MC-38527

The render distance has been set to an invalid value that isn't supported in 1.7.10. There are instructions in that post to resolve this.

migrated

(Unassigned)

Unconfirmed

Minecraft 1.7.10, Minecraft 1.8-pre1

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