Spawners turning into 1

[Tree182]

Minecraft's Version

Paper 1.12.2

Plugin's Version

latest

Describe the bug

when players tp away from a stack of spawners, it sometimes (really unpredictably, I cant figure out how to reliably recreate it) but always randomly will just turn back into 1 spawner when the player returns.

The hologram completely goes and the server treats it like it is 1 spawner. This can be fixed by rebooting the server (tf the spawner isnt mined) then the stack comes back.

To Reproduce

when players tp away from a stack of spawners, it sometimes (really unpredictably, I cant figure out how to reliably recreate it) but always randomly will just turn back into 1 spawner when the player returns.

The hologram completely goes and the server treats it like it is 1 spawner. This can be fixed by rebooting the server (tf the spawner isnt mined) then the stack comes back.

Additional Information

n/a

[OmerBenGera]

I need more information about how to replicate it, otherwise I won't be able to help.

[Tree182]

Im not sure what to say? It seems to happen when the player changes worlds but even then, it seems unpredictable (sometimes it happens, sometimes not)
It seems like it's unloading the hologram and then just assuming that there isnt a stack there anymore when the chunks unload. But the odd thing is that it is still showing as the right amount in the .db file. Does it not check that when breaking? It seems it relies on the info from the hologram maybe?

[OmerBenGera]

The hologram and all the data of spawners is cached in memory, and it does not check the DB for every action against a spawner (obviously, otherwise it will lag your server).
Keep trying to understand how to replicate it and report back.

[Tree182]

Well it seems like something is making it not read that cache.

Ive spent about a week trying to replicate it and it seems random as far as I can tell. I dont know the code so im not sure what else I can do.

Do you have any specific tests you want me to do? Or would you like the details to come take a look yourself?

[OmerBenGera]

Well it seems like something is making it not read that cache.

Ive spent about a week trying to replicate it and it seems random as far as I can tell. I dont know the code so im not sure what else I can do.

Do you have any specific tests you want me to do? Or would you like the details to come take a look yourself?

I recommend trying it on a localhost server with only WildStacker installed.
Spawners are unloaded and loaded when chunks are unloaded and loaded, probably something related to that

[Tree182]

Ive tried that (not a local server but an empty server with only wildstacker)
The only remote consistency that I can seem to find is that every time it happens, it seems to be when the player changes worlds. So they go from the end to the overworld for example.

I think you are right about it being that event that loads the spawners, for some reason it isnt re-adding them into the cache or adding the hologram.

Ive spent like a week trying to figure this out. Im here as a last resort. I know I don't subscribe to your patreon but I did pay for this plugin originally when it was paid (search spigot for Tree182) so can you take a look at that part of the code maybe please? to see if theres some way its not being properly loaded? or maybe give me some steps to debug it?

Any help would be greatly appreciated.

[OmerBenGera]

Any time a chunk is loaded the spawners are added to the cache. I can add debug messages but it will be spammy a bit.
What is your discord? I will give you a copy with debug messages