[MC-206327] (Server) Using /locate in customized worlds on a structure that is very far away or doesn't exist freezes the game

The bug

Using /locate on a non-existent or very far away structure freezes the game. The game, however, unfreezes when a structure is found. It's best to reproduce in customized worlds with many biomes scattered in small patches.

How to reproduce

Download the Forest Biomes worldgen
Import it to a new MC world
Open it to LAN
Use /locate mansion
→ ❌ Game freezes

Linked issues

duplicates 1

MC-250276 The server sometimes freezes when attempting to locate structures or biomes that are far away Open

Attachments

206327.json

Comments 7

wobst.michael 2020-11-22T13:11:10Z

The client itself continues to run so far for me, but the server freezes instantly.

mxblue28 2020-11-22T13:16:29Z

Can reproduce in this specific circumstance with custom worlds, but not with similar cases (e.g. finding a mansion in a superflat world, or a nether fortress in a normal overworld).

user-aa418 2021-06-11T23:29:12Z

Minecraft crashes when I import the file.

W_V 2021-06-12T11:28:17Z

Here's a new one. It works, however, the game now unfreezes when the structure is found.

user-f2760 2023-04-21T11:56:07Z

I'd highly suggest actually merging this report with the much more up-to-date non-customized-exclusive version MC-250276. It's the same issue, but this report makes it seem like it's unique to customized worlds, while it is absolutely not.

clamlol 2024-01-19T06:48:27Z

I agree, there's no sense in having two open tickets for the same issue.

Avoma 2024-04-30T18:58:27Z

Resolving as a duplicate of MC-250276 since this report (MC-206327) is the same core problem. MC-250276 has more information, more issue links, and is kept up to date more frequently so I'll be resolving this ticket.