As said in the description, shells seems to be receiving scheduled server packages from the server. Those packages aren't deleted and are kept in a queue which can grow to a couple Gb in size often resulting in server crashes.

I'm playing in a modpack with other mods in it.

Minecraft ver.: 1.19.2
Mod ver.: 2.0.0-beta.16
modpack: Hexxytest++.zip
Launcher used: Prism launcher
Modlist:

• antighost-1.19.1-fabric0.58.5-1.1.5.jar
• appleskin-fabric-mc1.19.2-2.5.1.jar
• Applied-Botanics-fabric-1.4.6.jar
• appliedenergistics2-fabric-12.9.9.jar
• architects-palette-fabric-3.0.0.jar
• architecture_extensions-1.1.3+1.19.jar
• architectury-6.6.92-fabric.jar
• armourersworkshop-fabric-1.19.2-3.0.0-beta.9.jar
• artifacts-7.1.1+fabric.jar
• astronomical-1.0.1+1.19.2.jar
• authme-mc1.19.2-4.2.0.jar
• autoconfig1u-3.4.0.jar
• autorun-1.19.X-0.5.0.jar
• balm-fabric-1.19.2-4.6.0.jar
• blahaj_1.19-0.6.3.jar
• Bookshelf-Fabric-1.19.2-16.3.20.jar
• Botania-1.19.2-440-FABRIC.jar
• botarium-fabric-1.19.2-1.9.2.jar
• bwncr-fabric-1.19.2-3.14.1.jar
• cardinal-components-api-5.0.2.jar
• carryon-fabric-1.19.2-2.1.2.23.jar
• cc-restitched-1.101.2.jar
• cccbridge-mc1.19.2-fabric-v1.5.1.jar
• charm-fabric-1.19.2-4.4.4.jar
• chattoggle-5.0.0+1.19.2-fabric.jar
• chat_heads-0.12.3-fabric-1.19.2.jar
• chipped-fabric-1.19.2-2.1.5.jar
• Chunky-1.3.38.jar
• ChunkyBorder-1.1.34.jar
• cleancut-fabric-6.0+mc1.19.1-mc1.20.x.jar
• clickthrough-1.19.1-fabric0.58.5-0.4.jar
• climbladdersfast-2.2.3-1.18-fabric.jar
• cloth-config-8.2.88-fabric.jar
• Clumps-fabric-1.19.2-9.0.0+14.jar
• comforts-fabric-6.0.7+1.19.2.jar
• Controlling-fabric-1.19.2-10.0+7.jar
• convenientdecor-0.2.0.jar
• convenientnametags-1.0.0.jar
• copycats-2.1.2+mc.1.19.2-fabric.jar
• core-2.0.2+kt.1.8.20+flk.1.9.3.jar
• CosmeticArmor-1.19-1.4.2.jar
• CraftTweaker-fabric-1.19.2-10.1.55.jar
• create-fabric-0.5.1-f-build.1416+mc1.19.2.jar
• create-origins-v1.2.1-fabric-quilt+1.19.2.jar
• createaddition-fabric+1.19.2-1.2.3.jar
• createoreexcavation-fabric-1.19-1.2.3.jar
• createrailwaysnavigator-fabric-1.19.2-0.5.4.jar
• createutilities-0.3.0+1.19.2.jar
• deathlog-0.2.11+1.19.jar
• defaultoptions-fabric-1.19-15.0.2.jar
• Ding-1.19.2-Fabric-1.5.0.jar
• Display Case-quilt-1.19-1.0.7.jar
• DistantHorizons-2.1.2-a-1.19.2-forge-fabric.jar
• do-a-barrel-roll-2.6.2+1.19.2-fabric.jar
• duckyperiphs-1.19.2-1.2.3-fabric.jar
• dummmmmmy-1.19.2-1.7.2-fabric.jar
• dynamic-fps-3.5.1+minecraft-1.19.0-quilt.jar
• ears-fabric-1.19-1.4.6.jar
• EasyAnvils-v4.0.11-1.19.2-Fabric.jar
• EasyMagic-v4.3.3-1.19.2-Fabric.jar
• EasyShulkerBoxes-v4.4.1-1.19.2-Fabric.jar
• emi-1.1.8+1.19.2+fabric.jar
• emicompat-2.0.3.jar
• EMIEnchants-fabric-1.19.2-1.0.0.jar
• emiffect-0.1.5+mc1.19.2.jar
• EMITrades-fabric-1.0.2+mc1.19.2.jar
• emi_loot-0.6.6+1.19.jar
• entityculling-fabric-1.6.1-mc1.19.2.jar
• ephemera-fabric-1.19.2-0.1.2.jar
• Estrogen-4.1.0+1.19.2-fabric.jar
• extendedgears-2.1.1-1.19.2-0.5.1.f-fabric.jar
• extra-mod-integrations-0.1.2+1.19.2.jar
• extremesoundmuffler-3.39-fabric-1.19.2.jar
• fabric-carpet-1.19.2-1.4.84+v221018.jar
• fabrication-3.4.9+1.19.jar
• farmers-delight-fabric-1.3.10.2.jar
• FauxCustomEntityData-fabric-1.19.2-2.0.2.jar
• ferritecore-5.0.3-fabric.jar
• figura-0.1.5-rc.1+1.19.2-fabric-mc.jar
• findme-3.1.0-fabric.jar
• foodeffecttooltips-1.1.2.jar
• ForgeConfigAPIPort-v4.2.11-1.19.2-Fabric.jar
• ftb-chunks-fabric-1902.4.6-build.360.jar
• ftb-library-fabric-1902.4.1-build.236.jar
• ftb-teams-fabric-1902.2.14-build.123.jar
• fusion-1.1.1-fabric-mc1.19.2.jar
• garnished-1.9.8+1.19.2-fabric.jar
• geckolib-quilt-1.19-3.1.40.jar
• hexal-fabric-1.19.2-0.2.19.jar
• hexbound-0.1.4+1.19.2.jar
• hexbyte-fabric-1.19.2-0.0.3.jar
• hexcasting-fabric-1.19.2-0.10.3d.jar
• hexcellular-1.0.2.jar
• HexCircus 1.1.2 [FABRIC].jar
• hexfaster-2.0.0.jar
• hexgloop-1.19.2-0.2.0-fabric.jar
• hexical-1.3.2.jar
• HexJS 1.1.1 [FABRIC].jar
• hexkeys-fabric-1.19.2-0.1.1.jar
• hexkinetics-fabric-1.19.2-0.7.2.jar
• hexresearch-fabric-1.19.2-1.0.1.jar
• hexstuff-fabric-1.19.2-0.1.0.jar
• hextweaks-3.2.3-fabric.jar
• HexVR 1.5.0 [FABRIC].jar
• Highlighter-1.19.1-fabric-1.1.4.jar
• Iceberg-1.19.1-fabric-1.0.46.jar
• iChunUtil-1.19.2-Fabric-1.0.0.jar
• immersive_paintings-0.6.7+1.19.2-fabric.jar
• impaled-1.1.4.jar
• indium-1.0.9+mc1.19.2.jar
• IngredientExtensionAPI-fabric-1.19.2-3.0.6.jar
• Jade-1.19.1-fabric-8.7.3.jar
• JadeAddons-1.19.2-fabric-3.2.0.jar
• jei-1.19.2-fabric-11.8.1.1033.jar
• justzoom_fabric_2.0.0_MC_1.19.2.jar
• kettle-2.2.1+1.19.2.jar
• konkrete_fabric_1.8.0_MC_1.19.1-1.19.2.jar
• krypton-0.2.1.jar
• kubejs-create-fabric-1902.2.4-build.46.jar
• kubejs-fabric-1902.6.2-build.73.jar
• kubejsadditions-fabric-3.2.2.jar
• labels-1.19.2-1.10-fabric.jar
• lambdynamiclights-2.2.0+1.19.2.jar
• lanishextendedstaves-fabric-1.19.2-0.2.0.jar
• lazydfu-0.1.3.jar
• light-overlay-7.0.0.jar
• lootr-fabric-1.19-0.4.28.69.jar
• magic_origins v0.3.5 1.19-1.19.3.jar
• malilib-fabric-1.19.2-0.13.0.jar
• markdown_manual-MC1.19.2-fabric-1.2.3+87774e1.jar
• mediaworks-fabric-1.19.2-1.0.7.jar
• memoryleakfix-fabric-1.17+-1.1.5.jar
• mirage-0.0.3-1.19.2-Fabric.jar
• modernfix-fabric-5.18.0+mc1.19.2.jar
• modmenu-4.2.0-beta.2.jar
• moonlight-1.19.2-2.3.5-fabric.jar
• moreiotas-fabric-1.19.2-0.0.4.jar
• MouseTweaks-fabric-mc1.19-2.22.jar
• NoChatReports-FABRIC-1.19.2-v1.13.12.jar
• observable-3.3.1.jar
• oneironaut-fabric-1.19.2-0.3.4.jar
• Origins-1.19.2-1.7.1.jar
• owo-lib-0.9.3+1.19.jar
• packages-fabric-1.19.2-3.4.1.jar
• Patchouli-1.19.2-77-FABRIC.jar
• pattern_schematics-1.1.8+fabric-1.19.2.jar
• paucal-fabric-1.19.2-0.5.0.jar
• Pehkui-3.8.3+1.14.4-1.21.jar
• polymorph-fabric-0.46.6+1.19.2.jar
• ponderjs-1.19.2-1.2.0.jar
• PuzzlesLib-v4.4.3-1.19.2-Fabric.jar
• qfapi-4.0.0-beta.30_qsl-3.0.0-beta.29_fapi-0.77.0_mc-1.19.2.jar
• quilt-kotlin-libraries-1.0.2+kt.1.8.0+flk.1.9.0.jar
• reacharound+1.19-1.3.0.jar
• rechiseled-1.1.6-fabric-mc1.19.2.jar
• redstonepen-1.19.2-fabric-1.2.18.jar
• requiem-2.0.0-beta.16.jar
• resourcefullib-fabric-1.19.2-1.1.24.jar
• Retraining-fabric-1.19.2-1.2.1.jar
• revelationary-1.3.5.jar
• rhino-fabric-1902.2.3-build.284.jar
• Runelic-Fabric-1.19.2-14.1.4.jar
• satin-1.9.2.jar
• servercore-1.3.3-1.19.2.jar
• ServerRedstoneBlock-fabric-1.19-1.0.0.jar
• simple-cobblestone-generator-1.1.11.jar
• sliceanddice-fabric-2.3.4.jar
• sodium-fabric-mc1.19.2-0.4.4+build.18.jar
• spark-1.10.37-fabric.jar
• spirit-fabric-1.19.2-2.2.7.jar
• StackDeobfuscatorFabric-1.4.2+bf1fc22.jar
• starlight-1.1.1+fabric.ae22326.jar
• Steam_Rails-1.6.4+fabric-mc1.19.2.jar
• supermartijn642configlib-1.1.8a-fabric-mc1.19.jar
• supermartijn642corelib-1.1.17-fabric-mc1.19.2.jar
• supplementaries-1.19.2-2.4.21-fabric.jar
• tis3d-MC1.19.2-fabric-1.7.4+72b79aa.jar
• toms_peripherals_fabric-1.19.2-1.2.1.jar
• tooltipfix-1.1.1-1.19.jar
• toomanybinds-0.3.3+1.19.jar
• trade-cycling-fabric-1.19.2-1.0.10.jar
• trashcans-1.0.18-fabric-mc1.19.2.jar
• trinkets-3.4.2.jar
• unloadedactivity-v0.5.4+1.19.2.jar
• veinmining-fabric-1.1.3+1.19.2.jar
• vinurl-1.1.1.jar
• vitalize-fabric-1.19.2-1.1.1.jar
• vivecraft-1.19.2-1.1.9-fabric.jar
• vmp-fabric-mc1.19.2-0.2.0+beta.7.30-all.jar
• voicechat-quilt-1.19.2-2.5.17.jar
• watson-fabric-1.14.4+1.19.2.jar
• wnboi-0.0.4-fabric.jar
• XaerosWorldMap_1.38.8_Fabric_1.19.1.jar
• Xaeros_Minimap_24.2.0_Fabric_1.19.1.jar
• xlc2spackets-mc1.19.2-1.1.jar
• youre-in-grave-danger-1.4.9.jar