Chunks not loading when the player is teleported

[SrBedrock]

Describe the bug

Chunk where the player is teleported does not load, only the chunks around him.

To Reproduce

Using a plugin that teleports the player such as essentialx, teleport to a location that is not loaded.
Player command: /home test

Plugins

Plugins (7): Essentials, EssentialsSpawn, GriefPrevention, LuckPerms, mcMMO, WorldEdit, WorldGuard

Version

This server is running Tuinity version git-Tuinity-"8608126" (MC: 1.16.1) (Implementing API version 1.16.1-R0.1-SNAPSHOT)

Misc

Player Teleport:

Seconds later:

Player Teleport:

Seconds later:

Player Teleport:

Seconds later:

Player Teleport:

...

[Gilthunderx]

It occurs on my server too, the chunks where you tp'ed doesn't load but the chunks around it does, I guess when tps is low when this usually happens.

[Spottedleaf]

I suspect there's something weird going on with the way chunk tickets are added and how the priority system is scheduling loads. Hard to tell given there's no debug tools we have to figure it out.
I'll be looking at the chunk system extensively when I finish the light / scheduling changes I have locally, so hopefully I catch it there.

[PaulBGD]

I wrote a small player botter that sends 75 players to the server and separates them 1k blocks apart, once they've all joined and loaded some chunks it was very easy to teleport to them and see the chunks around them in this unloaded state. This is without any plugins except the one to spawn players at different locations.

[SrBedrock]

Problem probably solved by PaperMC/Paper@b2381db

[Spottedleaf]

I doubt the issue will be fixed by that commit, but I've just updated upstream so you can check for yourself if it does.

[SrBedrock]

I doubt the issue will be fixed by that commit, but I've just updated upstream so you can check for yourself if it does.

Yep, problem persists after the update. 😢

[RocketManKian]

Please fix this urgently

[LucidAPs]

Oh my god I thought I was gonna go crazy trying to figure out why this was happening! Finally this issue will be addressed.

[SrBedrock]

Any news about this problem?
This is the worst possible bug, with 20 to 18 TPS it is literally unplayable, the world just doesn't load.

[SrBedrock]

Would it be better to open a report issue in PaperMC? I believe that this problem also occurs on servers using Paper.

[12emin34]

It would be but test it first

[Spottedleaf]

I'm pretty sure some of their changes are causing this, so as long as you can produce it on paper you're OK to report it to them as well (if you cannot let me know).

Latest should alleviate this issue a bit due to the light engine changes.

[Ultrajungleboy]

While trying to rewrite a plugin for paper and 1.16.5(cpcamerastudioreborn)
I also noticed this issue but in a different form, when the player is teleported every tick it doesnt load ANY chunks around the player, this also happens on spigot.

However, I added debug to tell me if the server says the chunks are loaded where the player is and its returning true

Maybe a packet problem?

Also I've tried force loading the chunks when the player is teleported and using asyncteleport and normal teleport

[Spottedleaf]

The problem is chunk load order is way off and it makes the client very confused so it wont render the chunks (you can see entities, but not the chunk)

[Ultrajungleboy]

Actually with the testing I've done with my plugin you cant see entites-- heres a clip of it in progress the way that im getting the chunks to load is by pausing the player every 400 ticks thats why you can see the blocks but no entity https://streamable.com/xerwbu

[Ultrajungleboy]

When im connected to the server via localhost this is what it looks like https://streamable.com/xqpfpb

[SrBedrock]

When im connected to the server via localhost this is what it looks like streamable.com/xqpfpb

I can't identify any problems with the video.

[SrBedrock]

That's the real problem, entities are loaded as spottedleaf explained above.

chunk-bug.mp4

[SrBedrock]

[Ultrajungleboy]

When im connected to the server via localhost this is what it looks like streamable.com/xqpfpb

I can't identify any problems with the video.

thats because im connected via localhost which means i have almost no latency

[Ultrajungleboy]

Also if you look at the first video I sent you can see that the entities arent loaded, this issue might be an entirely different issue but resolving this issue might fix your issue as well. I also posted this as an issue in the paper github

[Spottedleaf]

I've since pushed a dev branch, dev/playerchunkloading, that is aimed to generally fix this issue. Please note that it is a dev branch and therefore only really suitable for testing purposes, as with all dev branches.

[Ultrajungleboy]

I've since pushed a dev branch, dev/playerchunkloading, that is aimed to generally fix this issue. Please note that it is a dev branch and therefore only really suitable for testing purposes, as with all dev branches.

Hey, great job looks as if my issue has been fixed when I built and tested your dev branch! Thank you for the fast work :)

[Ultrajungleboy]

Chunks no longer load when the player is constantly teleported every tick as of the last commit in the main branch. however this did work in the fix frustrum commit

[Spottedleaf]

try now (f8c0db4)

[Ultrajungleboy]

I downloaded the master branch jar from Jenkins and I still get the same result no chunks loading when the player is constantly teleported if you would like to test this yourself there's a plugin called cpcamerastudioreborn that can mimic this for you and I have yet to experience a crash using the frustum update

Although you need to test it with some latency - you cant use localhost or they will always load regardless

UPDATE -- with higher latency like 150ms on the version before it was merged to main. when the player is teleported every tick sometimes a teleport is skipped resulting in something along the lines of 8-12 teleports a second when it should be 20--I cannot confirm if the new master branch fixes this as the chunks no longer load. ALSO the lower the latency the more teleports go through -- for example, for me, it looks perfect

Video of it running on a connected player:
https://streamable.com/h0wbw5

EDIT: now FIXED and chunks are loading on most recent commit for dev/playerchunkloading
2830324
although the entities don't load this is an entirely different issue

[JRoy]

fixed as of dev/playerchunkloading merged