[MC-178029] Chunks get scrambled by logging in twice on solo world

Logging in to a solo world twice on the same computer causes chunks to get scrambled.

To recreate:
1. Open Minecraft twice on one computer
2. Log into world on First Client
3. Log into world on Second Client
4. Save and Quit on Second Client
5. Save and Quit on First Client
6. Log into world on First Client

Environment

Windows 10 Home - 64-bit
(Java Version 8 update 191 (build 1.8.0_191-b12)

Attachments

Comments 6

Michael Wobst 2020-04-09T20:58:38Z

Please test if this is also an issue in the latest 1.16 development snapshot. Currently this is 20w15a.

migrated 2020-04-09T21:11:32Z

In Snapshot 20w15a, the game does not allow me to run the world on two clients at the same time. saying, "Locked by another running instance of Minecraft". So it doesn't seem to be an issue. Thanks.

migrated 2020-04-09T21:12:24Z

Also, do you know if it is possible to unscramble the chunks in my world without resetting altogether?

Michael Wobst 2020-04-09T21:15:54Z

Unlikely that this is possible.

Michael Wobst 2020-04-09T21:16:16Z

Confirmed fixed in 20w15a. See

[media]

migrated 2020-04-09T21:21:50Z

That's unfortunate, thanks though.