mojira.dev
MC-216148

Some chunks occasionally don't save properly, resetting progress

I've been playing on a vanilla snapshot server with friends, when I encountered a bug where chunks would fail to update / save after blocks were placed or removed. This is only effecting a select few chunks.

 

In the screenshots you can see me place two grimstone blocks down. After this, I leave the server and rejoin, the pillar is gone and I am missing my two grimstone blocks.

 

This effectively makes this area impossible to build in, as anything you place is lost once you leave. I'm not sure why chunks are straight up not updating or saving, I did nothing out of the ordinary.

 

I have tried to restart the server to fix the issue, but it persists even after that.

 

EDIT: I have tested this further, and after I killed myself in game from fall damage, the issue no longer occurs. I have no idea what caused it to trigger in the first place, but it definitely seems like a pretty big issue as you can easily obtain infinite resources with it if you figure out how to purposefully trigger it.

Related issues

MC-215815 My build just dissappear! MC-215931 when going through a nether portal the chunks reset MC-216570 diamonds being rolled back MC-217541 Nether Glitch MC-219026 Corrupting Chunks MC-219323 Progress in nether occasionally is not saved MC-219487 Desert temple resets 21w10a MC-220017 chunk setbacks/not saving MC-220210 Chunks don't get saved properly MC-220568 World Progress can't be made MC-220682 Duplication Glitch MC-221388 Builds reverting to natural state. MC-222122 Savestate bug MC-222196 Weird chunk saving MC-222406 only half of constructions MC-222424 only half of constructions MC-222426 only half of constructions MC-222687 Chunks Reset to a different seed during a client lag spike on a boat. MC-222935 Chunks Reseting/Regenerating MC-223041 Chunk reseting placed/destroyed blocks after relog MC-223081 Resources and blocks duped/lost when leaving an area "too quickly" MC-223128 Chunks disappear MC-223965 Unlimited Anvils MC-224080 Chunk Saving Error MC-224596 Dimension setback upon unloading

Attachments

Comments

migrated
[media][media]
tryashtar

Hmm, sounds similar to MC-216570. There may be something to this

migrated

I experienced this bug a couple of times in a 21w11a server.
I also noticed that tile entities such as hoppers or furnaces were not updating, staying frozen in time while block interactions like placing water and having it flow would work just fine.
Leaving the server and joining back caused the chunks to "wake up" but all data on those chunks rolled back and progress didn't save.

Mask3D_WOLF

Relates to MC-63

migrated

BlaCoiso, confirm. This problem often appears on the vanilla server 21w11a. 

migrated

So the same happens to me, now after regenerating the chunks, they stay (at least until now).
I play single player. Also a whole village dissapeared.

migrated

Wait, if a village disappeared too, it must affect world gen in some way.

migrated

How 1.16.5 is affected?

migrated

We have been running Snapshots as a Server and can confirm this happens in parallel to furnaces, hoppers, chest, sticky pistons, etc breaking.
(Would venture to say this has been present in the first few snapshots and up until now has not been patched)

Manually running /save-all helps with fixing broken chunks (Regarding not saving) but furances, hoppers, chest, stickypistons, etc.. is less deterministic (Usually relogging, leaving the chunk, coming back sometimes fixes it)

 Still Effects 21w17a

migrated

My experience with this is that chunks are not reliably saved when going through a nether portal. Frequently items that were placed or blocks that were broken immediately going through the nether portal are reset when you return.

affects 21w14a

migrated

(Unassigned)

Confirmed

Very Important

Chunk loading

21w06a, 21w07a, 21w10a, 21w11a, 21w13a, 21w14a, 21w16a, 21w17a

21w18a

Retrieved