Hello, I am running a 1.18.2 Fabric server and sometimes chains that exist within more than one chunk disappear. I'm guessing this has something to do with only one of the chunks loading and this breaking the chain?

I reduced to a minimum + those that I no longer know:

animatica-0.4+1.18.jar
c2me-fabric-mc1.18.2-0.2.0+alpha.7.38.jar
cc-restitched-1.100.8.jar
cem-0.7.1.jar
Clumps-fabric-1.18.2-8.0.0+17.jar
collective-1.18.2-7.7.jar
completeconfig-lib-1.4.1.jar
continuity-2.0.1+1.18.2.jar
cullleaves-2.3.2.jar
CullLessLeaves-1.0.1.jar
debugify-1.11.0-fabric-1.18.2.jar
DisplayCase-fabric-1.18.2-1.0.3.jar
dynamic-fps-3.3.3+minecraft-1.16.5.jar
enhancedblockentities-0.6+1.18.2.jar
entity-texture-features-3.0.4-mc1.18.x.jar
entityculling-fabric-mc1.18-1.5.1.jar
etched-fabric-2.2.1+1.18.2.jar
fabric-api-0.76.0+1.18.2.jar
fabric-language-kotlin-1.9.1+kotlin.1.8.10.jar
fabrictailor-1.9.0+1.18.2.jar
fabrishot-1.7.0.jar
farsight.fabric-1.18-1.9.jar.disabled
Fastload+1.18.2-1.5.10.jar
homabric-2.0.0.jar
indium-1.0.7+mc1.18.2.jar
iris-mc1.18.2-1.6.11.jar
item-model-fix-1.0.3+1.18.jar
Jade-1.18.2-fabric-5.100.0.jar
lambdabettergrass-1.2.3+1.18.jar
lambdynamiclights-2.1.0+1.17.jar
lazydfu-0.1.2.jar
leashmod-1.0.5.jar
lithium-fabric-mc1.18.2-0.10.3.jar
Measurements-fabric-1.18.2-1.3.1.jar
memoryleakfix-fabric-1.17+-1.1.2.jar
midnightlib-0.4.4.jar
mixintrace-1.1.11.17.jar
nofade-1.18-2.0.1.jar
notenoughanimations-fabric-1.7.0-mc1.18.2.jar
observable-2.2.3-fabric.jar
optigui-2.0.0-alpha.4.jar
Patchouli-1.18.2-71.1-FABRIC.jar
Pehkui-3.7.12+1.14.4-1.20.4.jar
phonos-0.31.18.2.jar
pollen-fabric-1.6.1+1.18.2.jar
polymer-all-0.2.0-rc.4.8+1.18.2.jar
polysit-0.0.2+mc.1.18.2.jar
puzzle-1.4.1-1.18.jar
reeses_sodium_options-1.4.3+mc1.18.2-build.42.jar
Rrls-1.18.2-3.1.0-fabric.jar
servercore-1.2.9-1.18.2.jar
Slideshow-fabric-1.18.2-1.0.2-hotfix-1.jar
slight-gui-modifications-2.1.0.jar
smoothboot-fabric-1.18.2-1.7.0.jar
sodium-extra-0.4.17+mc1.18.2-build.94.jar
sodium-fabric-mc1.18.2-0.4.1+build.15.jar
starlight-1.0.2+fabric.89b8d9f.jar
taterzens-1.8.5-fabric.jar
TieFix-1.9.0.jar
tooltipfix-1.0.4-1.18.jar
trinkets-3.3.1.jar
vmp-fabric-mc1.18.2-0.2.0+beta.3.126-all.jar
webstreamer-1.2.3.jar
windchimes-1.2.0.jar
yosbr-0.1.1.jar

if you want the entire list:

3dskinlayers-fabric-1.5.2-mc1.18.2.jar
Adorn-3.5.0+1.18.2-fabric.jar
advancementinfo-1.18.2-fabric0.47.10-1.3.1.jar
animatica-0.4+1.18.jar
another_furniture-fabric-1.2.2-1.18.2.jar
antighost-1.18.2-fabric0.47.10-1.1.4.jar
appleskin-fabric-mc1.18.2-2.4.1.jar
architectury-4.11.93-fabric.jar
arrp-0.5.7.jar
automobility-0.3+1.18.2.jar
badpackets-fabric-0.1.3.jar
bettercombat-fabric-1.5.5+1.18.2.jar
bettermounthud-1.1.4.jar
better_climbing-1.1.0-FABRIC.jar
borderless-mining-1.1.2+1.18.2.jar
c2me-fabric-mc1.18.2-0.2.0+alpha.7.38.jar
campanion-3.0.4.jar
camsbackpacks-2.2.jar
Capes-1.3.1+1.18.2.jar
cc-restitched-1.100.8.jar
cem-0.7.1.jar
chisel-1.4.51.18.2.jar
ChiselsBits-fabric-1.18.2-1.2.116.jar
CITResewn-1.0.1+1.18.2.jar
classicombat-1.0.5-1.18.2.jar
cloth-api-3.2.64.jar
cloth-config-6.5.102-fabric.jar
Clumps-fabric-1.18.2-8.0.0+17.jar
collective-1.18.2-7.7.jar
completeconfig-lib-1.4.1.jar
connectiblechains-2.1.4+1.18.2.jar
continuity-2.0.1+1.18.2.jar
cullleaves-2.3.2.jar
CullLessLeaves-1.0.1.jar
debugify-1.11.0-fabric-1.18.2.jar
decorative-4.2.0.jar
disguiselib-1.2.2-fabric.jar
DisplayCase-fabric-1.18.2-1.0.3.jar
DistantHorizons-2.0.1-a-1.18.2.jar
do-a-barrel-roll-2.6.2+1.18.2-fabric.jar
doubledoors-1.18.2-5.1.jar
dwayne-the-block-johnson-2.1.1.jar
dynamic-fps-3.3.3+minecraft-1.16.5.jar
EditSign-1.18.2-2.3.1.jar
elytratrinket-fabric-3.0.0-1.18.1.jar
emotecraft-for-MC1.18.2-2.2.7-b.build.50-fabric.jar
enhancedblockentities-0.6+1.18.2.jar
entity-texture-features-3.0.4-mc1.18.x.jar
entityculling-fabric-mc1.18-1.5.1.jar
etched-fabric-2.2.1+1.18.2.jar
extractinator-fabric-1.18.2-2.0.1.jar
fabric-api-0.76.0+1.18.2.jar
fabric-language-kotlin-1.9.1+kotlin.1.8.10.jar
fabrictailor-1.9.0+1.18.2.jar
fabrishot-1.7.0.jar
factory-blocks-mod-1.0.01.18.2.jar
farsight.fabric-1.18-1.9.jar.disabled
Fastload+1.18.2-1.5.10.jar
ferritecore-4.2.1-fabric.jar
firstperson-fabric-2.2.2-mc1.18.2.jar
freecam-fabric-modrinth-1.1.9+1.18.jar
geckolib-fabric-1.18-3.0.80.jar
gmod-title-screen-1.1+1.18.jar
graves-2.0.3+1.18.2.jar
headindex-1.0.8-1.18.2.jar
held-item-info-1.4.2+1.18.jar
homabric-2.0.0.jar
HWGMod-1.18.2-1.1.12.jar
iammusicplayer-fabric-1.18.2-3.16.5.jar
image2map-0.2.2.jar
immersive_aircraft-0.5.21.18.2-fabric.jar
immersive_paintings-0.6.71.18.2-fabric.jar
indium-1.0.7+mc1.18.2.jar
infinitybuttons-4.0.1-mc1.18.2.jar
iris-mc1.18.2-1.6.11.jar
item-model-fix-1.0.3+1.18.jar
Jade-1.18.2-fabric-5.100.0.jar
journeymap-1.18.2-5.9.2-fabric.jar
lambdabettergrass-1.2.3+1.18.jar
lambdynamiclights-2.1.0+1.17.jar
language-reload-1.2.1.jar
lanterns-belong-on-walls-1.3.0-1.18.x.jar
lazydfu-0.1.2.jar
leashmod-1.0.5.jar
libIPN-fabric-1.18.2-2.0.2.jar
lithium-fabric-mc1.18.2-0.10.3.jar
mcw-doors-1.1.0fabric-mc1.18.2.jar
mcw-furniture-3.2.2-mc1.18.2fabric.jar
mcxr-core-0.2.1.jar
Measurements-fabric-1.18.2-1.3.1.jar
memoryleakfix-fabric-1.17+-1.1.2.jar
midnightlib-0.4.4.jar
mixintrace-1.1.11.17.jar
Modern-Elevators-Escalators-fabric-1.18.2-3.1.6.jar
modmenu-3.2.5.jar
morechathistory-1.18-1.1.0.jar
moreredlamps-0.0.2-1.18.jar
MTR-fabric-1.18.2-3.2.2-hotfix-1.jar
MTR-NTE-0.4.21.18.2.jar
nicemod-1.2 - 1.18.2.jar
nofade-1.18-2.0.1.jar
notenoughanimations-fabric-1.7.0-mc1.18.2.jar
observable-2.2.3-fabric.jar
optigui-2.0.0-alpha.4.jar
otyacraftengine-fabric-1.18.2-2.14 (1).jar
paladin-furniture-mod-1.2.1-fabric-mc1.18.2.jar
Patchouli-1.18.2-71.1-FABRIC.jar
Pehkui-3.7.12+1.14.4-1.20.4.jar
phonos-0.31.18.2.jar
Pick-Block-Pro-1.5.11-mc1.18.2.jar
Ping-Wheel-1.7.1-fabric-1.18.2.jar
plantinajar-2.3.1.jar
plasmovoice-fabric-1.18-1.2.19.jar
player-animation-lib-fabric-0.4.2+1.18.jar
polaroidcamera-1.2.9.jar
pollen-fabric-1.6.1+1.18.2.jar
polymer-all-0.2.0-rc.4.8+1.18.2.jar
polysit-0.0.2+mc.1.18.2.jar
PresenceFootsteps-1.5.1.jar
puzzle-1.4.1-1.18.jar
reeses_sodium_options-1.4.3+mc1.18.2-build.42.jar
RoughlyEnoughItems-8.3.681-fabric.jar
Rrls-1.18.2-3.1.0-fabric.jar
servercore-1.2.9-1.18.2.jar
ShowMeWhatYouGot-1.18-1.0.1.jar
sidekick-fabric-2.0.51.18.2.jar
Slideshow-fabric-1.18.2-1.0.2-hotfix-1.jar
slight-gui-modifications-2.1.0.jar
slotlock-1.1.1-BETA+1.18.jar
smoothboot-fabric-1.18.2-1.7.0.jar
sodium-extra-0.4.17+mc1.18.2-build.94.jar
sodium-fabric-mc1.18.2-0.4.1+build.15.jar
sound_track-1.0.7.jar
starlight-1.0.2+fabric.89b8d9f.jar
super-secret-revival-1.3+1.18.jar
tabtps-fabric-mc1.18.2-1.3.13.jar
taterzens-1.8.5-fabric.jar
tempad-fabric-1.18.2-1.4.1.jar
TieFix-1.9.0.jar
tooltipfix-1.0.4-1.18.jar
trank_o_mat-fabric-1.18.2-1.2.0.jar
trashcans-0.0.2-1.18.X.jar
trinkets-3.3.1.jar
vanish-1.1.0.jar
vmp-fabric-mc1.18.2-0.2.0+beta.3.126-all.jar
webstreamer-1.2.3.jar
windchimes-1.2.0.jar
wired-redstone-0.3.10+1.18.2.jar
worldedit-mod-7.2.10.jar
yosbr-0.1.1.jar
Zoomify-1.6.0.jar
[1.18]+fabric-pigeonpost-3.0.0.jar

I have the same problem on the same version, I think it's due to optimization mods that I added to load the chunks faster.

That would explain why I couldn't recreate the issue. Which relevant mods do you have installed?

I cannot recreate this issue, could you upload a world that we can take a look at.
Also, what is your configured "Max Chain Distance"?

Happens to me aswell, chains that cross chunk boundaries have a chance to break, unsure how to reproduce exactly but every now and then I notice a chain missing.

Unfortunately, this issue is getting quite old now. And the issue was created for mc 1.18.x.
I do not support this version any more.
Unless this still applies in the latest version of this mod, this issue will be closed.