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MCPE-238131

Some seeds could deadlock the game while loading

Steps to reproduce:

Use the seed: -8451073641563396119

Turn on the “Drop 2 of 2026” experiments.

Create the world.

Expected result:

The game load normally

Actual result:

The loading screen stopped at ~20% and deadlock. It will never finish (I waited for over 10 minutes and it still stuck at there)

Guess:

This seed has a “sinkhole” with extremely low weirdness value next to spawn, which make the preliminary surface height drop below Y=-64, and sulfur caves also generates at negative weirdness, maybe sulfur caves tried to place blocks/update things below Y=-64, which is a invalid place, then the game deadlocked while loading.

If you load a seed with extremely low weirdness sinkhole not close to spawn, the world can load correctly but when you go to the sinkhole, the game will still crash.

This bug won’t occur without the experiment “Drop 2 of 2026”.

Attachments

Comments 3

MCPE-238131 When loading a sinkhole with negative weirdness, the client is fine but the server goes unresponsive. When the sinkhole is close enough, the server “crashes” before players can enter the world, preventing entities and chunks from loading and therefore the world generation process never finishes.

Cannot Reproduce In 26.30.25 Preview.

COMETC2021A1

(Unassigned)

1599482

Confirmed

Multiple

26.20.28 Preview, 26.20.26 Preview, 26.20.27 Preview, 26.30.21 Preview, 26.30.20 Preview

26.30.26 Preview, 26.30.25 Preview, 26.30

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