dosen't unload anything when traveling far , chunks remain loaded and eventually crashes, staying to build dosent cause this problem , only loading chunks causes this problem

Please post more information, ideally a log, and how you know that this is a Quark-specific issue

steps to reproduce

-fresh instal forge
-instal crash utilities to monitor loaded chunks
-instal most mods > notice that chunks and entities unload when traveling using elytra and rockets

-fresh instal forge
-instal crash utilities to monitor loaded chunks
-instal autoreglibs (dependency) and quark > notice that chunks and entities dont unload when traveling using elytra and rockets

This comment will probably not help at all, as all tests we done were not very conclusive:
Only Tests which somehow point to Quark are Test 1 including subtests B and C.
But best bet atm is some incompatibility between mods.
PS: if you think its worth to check logs, please tell us which logs you need and how we can capture them

1. Test

can confirm this issue using Quark-3.0-334.jar, AutoRegLib-1.7-52.jar under forge 39.0.44

• world was initially created without quark
• change in use case, teleported instead of using elytra, while we had a lot of memory leakage using elytra too

Test Steps:

1. used forge entity list to check items in place A (~200 items)
2. teleported to place B (~400 items)
3. teleported back to place A still around 400 items

1. Test B

removing Quark for from mod pack, repeating steps 1-3:
teleporting back to place A: Items back to around 200 items as expected.

1. Test C

retested using forge 39.0.63 and quark: issue reproducible

2. Test

As prev. Tests were done using several other mods (70+) which may facilitate the issue OR cause by a different mod entirely we made another test only using forge 39.0.63, Quark-3.0-334.jar, AutoRegLib-1.7-52.jar and a new flat world, placing specific items to check if chunks get unloaded:
NOT reproducible - still full test settings/steps:

world settings:
creative, difficulty peaceful, allow cheats on, world type superflat, generate structure off, seed 0

spawn coordinates 0 -60 -0

Test Steps:

1. command forge entity list: total 13 (some sheep, pigs, horse and 1 player)
2. teleport away from spawn 5000 -60 5000
3. placing "unique" item "item frame"
4. command forge entity list: total 14 (some sheep, pigs, horse and 1 player, and our new item frame, expected as spawn will not unload)
5. teleport back to spawn 0 -60 0
6. wait a bit to give the server time to unload chunks
7. command forge entity list: entities back to 13; chunk unloaded

Conclusion so far: mod incompatibility?

3. test

using superflat world from 2. test, but using all mods from test one
same steps as in test 2

Still not reproducible
Conclusion so far: Confusing so far!

4. test

new world, using default settings, only gamemode is creative, seed 0, only quark

spawn coordinates ~46 66 24

Test Steps:

1. command forge entity list: Total entities: ~149
2. teleport away from spawn 5000 100 5000
3. command forge entity list: Total entities: ~171
4. place item frame
5. FYI: while repeating " forge entity list" at 5000 5000, minecraft:falling block items increased and did not disappear
6. teleport back to spawn, item frame not listed (OK)
7. command forge entity list: Total entities: ~153 - seems to be fine
8. start flying away from spawn to around -1000 100 100
9. command forge entity list: Total entities: ~272
10. place item frames (e.g. 4)
11. move away (teleport/flying does not matter)
12. chunks unloaded

5th test

new world, using default settings, only gamemode is creative, seed 0, all mods from test one, steps from test 4

this time issue was only reproducible flying away, not by teleporting away

personally i wanted to find out the issue cdue to the amount of time we crashed due to the amount of player it made it unfun to play

removed a hanful of irelevant mod / problem persisted
removed superficial but fun mod and kept only he most important / problem gone

tested a few mod at the time from the superficial , noticed quark was one of them

tested them all individually, found it

tested every mods together, all fine , unload properly

test ONLY quark and autoreglib, does not unload

so its ethier quark or autoreglib, but due to quark requiring it as a dependency it is related as it is built on it

Did some testing. Seems like some Quark feature is accidentally causing the chunks to not unload fully - Forge unload events are not fired on the server side, etc.

This value in the F3 screen shows the amount of the integrated server's loaded chunk list:

With all modules disabled, this amount drops normally, staying stable around one number. I'm investigating further.

It's Feeding Troughs, enabling just that one feature causes this.