[MC-204878] World seed 0

When you take a world from 1.16.4 to 1.15.2 the seed automatically changes to 0. Even if you optimized the world. Also one time I got a Version with a really weird light bug. It keeps the seed 0 even if you take it back to 1.16.4 and optimize it again.

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Aiden Andres 2020-11-09T19:23:33Z

Heyo, think I know why. When your allocated RAM is full/nearly full in Minecraft and/or Java, it loads the worlds chunk incorrectly. For proof, if you actually rejoin the world, the chunks may change. Not sure about the Seed-0 though, might be the same reason.

Tim Mayr 2020-11-09T19:26:16Z

I created the world with optifine installed and 12 gigabytes of RAM reserved for Minecraft.

Tim Mayr 2020-11-09T19:29:34Z

And because I'm dumb, I made this in my Redstone testing world with hours of work, where I found another bug, that I tested in different the 1.15.2 Version, and now that world is seed 0 instead with everything deleted.

I hope I still have a backup.

Marty McFly 2020-11-09T19:30:11Z

Downgrading worlds is not supported.

Tim Mayr 2020-11-09T19:31:23Z

But Why, why would Mojyng do that?

Marty McFly 2020-11-09T19:34:55Z

It is difficult enough to support the current version. They do not have the resources to support every previous version of the game.

Tim Mayr 2020-11-09T19:43:03Z

That's true. But at least I found a backup of the world and I have everything back.