What happened?
If you change the config for spawns in citadel to above 1 would generation stalls out at around 4% console shows no error, Minecraft is still responsive, but it just stops loading past around 3-4%
this is a large modpack with custom kubejs below is the mod list in log output

Minecraft Version
1.19.2

Citadel version
citadel-2.1.4-1.19.jar

Relevant log output
TerraBlender (Forge) (by TheAdubbz)
Capable Cauldrons (by TeamCoFH)
Smooth Boot (Reloaded) (by AbdElAziz333)
Item Filters (by LatvianModder)
Radiant Gear (Fabric/Forge/Quilt) (by TheIllusiveC4)
Reap Mod (by henkelmax)
Charm of Undying (Fabric/Forge/Quilt) (by TheIllusiveC4)
JER Integration (by AlasDiablo)
Regions Unexplored (forge/fabric) (by UHQ_GAMES)
Integrated Dynamics (by kroeser)
Glassential (by Lykrast)
YUNG's Better Witch Huts (Forge) (by YUNGNICKYOUNG)
Custom Machinery (by frinn38)
Ars Creo (by baileyholl2)
Pluto (by AbdElAziz333)
KubeJS (by LatvianModder)
Citadel (by sbom_xela)
TexTrue's Rubidium Options (by TexTrue)
Every Compat (Wood Good) (by MehVahdJukaar)
GraveStone Mod (by henkelmax)
KubeJS Mekanism (by LatvianModder)
Fabric API (by modmuss50)
SeasonHUD (by IanAnderson)
Fog Looks Good Now (by CAPPIN1)
AppleSkin (by squeek502)
Integrated NBT (by scleox)
Advancement Plaques [Forge] (by Grend_G)
YUNG's Better Desert Temples (Forge) (by YUNGNICKYOUNG)
StarbuncleMania (by Alexth99)
Colorful Azaleas (by kekie6)
Sand Box (by noeppinoeppi)
bad packets (by badasintended)
Cosmetic Armor Reworked (by LainMI)
YUNG's Better Mineshafts (Forge) (by YUNGNICKYOUNG)
Sound Physics Remastered (by henkelmax)
PneumaticCraft: Repressurized (by desht_08)
Create Enchantment Industry (by DragonsPlus)
Crash Utilities (by Darkere)
Hopo Better Underwater Ruins (by hoponopono)
Spice of Life: Apple Pie Edition (by Anthxny)
Serene Seasons Fix (by Or_OS)
Placebo (by Shadows_of_Fire)
Guard Villagers (by almightytallestred)
Rhino (by LatvianModder)
FancyMenu [Forge] (by Keksuccino)
Build Guide (Forge+Fabric) (by brentmaas)
Integrated Dungeons and Structures (by CraisinLord)
BlockUI (by Raycoms)
The Undergarden (by Quek04)
SuperMartijn642's Core Lib (by SuperMartijn642)
Loot Journal (by Obscuria)
Mekanism Generators (by bradyaidanc)
Entity Culling Fabric/Forge (by tr7zw)
Spelunkery (by OrdanaryMods)
The Twilight Forest (by Benimatic)
CoFH Core (by TeamCoFH)
Enchantment Descriptions (by DarkhaxDev)
When Dungeons Arise - Forge! (by Aureljz)
Decorative Blocks (by stohun)
♬ Aquamirae Mod EXTRA Music ♬ (by theexiiedfeiiow_)
Why stacks of 16? (by LaidBackSloth42)
CorgiLib (by Corgi_Taco)
Let Me Despawn (by frikinjay)
FTB Backups 2 (by FTB)
Clumps (by Jaredlll08)
Patchouli (by Vazkii)
The One Probe (by McJty)
Serene Seasons (by TheAdubbz)
Resourceful Lib (by ThatGravyBoat)
Puzzles Lib [Forge & Fabric] (by Fuzs)
Tool Stats (by DarkhaxDev)
Flywheel (by jozufozu)
Better Fps - Render Distance[Forge] (by someaddon)
Create (by simibubi)
YUNG's Bridges (Forge) (by YUNGNICKYOUNG)
Thermal Dynamics (by TeamCoFH)
Prism [Forge] (by Grend_G)
Incendium (by Starmute)
Create Deco (by talrey)
Towers of the Wild: Reworked (Datapack) (by xPand_4B)
Fantasy's Furniture (by ApexMdr)
Apocalyptic Fortress (by hexnowloading)
Hals Enhanced Biomes (by halbear_gamez)
Buzzier Bees (by TeamAbnormals)
Galosphere Delight (A Farmer's Delight Add-on) (by nocubeyt)
Open Loader (by DarkhaxDev)
Server Performance - Smooth Chunk Save[Forge/Fabric] (by someaddon)
Farmer's Respite (by lumpazl)
Integrated Stronghold (by CraisinLord)
Integrated Stronghold- The Graveyard Integration (by CraisinLord)
Mekanism (by bradyaidanc)
Ender Storage 1.8.+ (by covers1624)
Alex's Delight (by NCP_Bails)
MineColonies (by Raycoms)
Structory (by botanydev)
Create Crafts & Additions (by MRHminer)
Bookshelf (by DarkhaxDev)
Integrated Tunnels (by kroeser)
Too Many Glyphs (by derringercubed)
Iter RPG (by AcmaKurihara)
Slimy Stuff (by Furti_Two)
Aquamirae (Forge) (by Obscuria)
Audio Extension for FancyMenu [Forge] (by Keksuccino)
Configured (by MrCrayfish)
Just Enough Resources (JER) (by way2muchnoise)
Create Confectionery (by Furti_Two)
Supplementaries (by MehVahdJukaar)
Trample No More (by DarkhaxDev)
Night Lights (by joosh_7889)
Keymap (by nEinjerjar)
Traveler's Backpack (by Tiviacz1337)
Legendary Tooltips [Forge] (by Grend_G)
KubeJS Botania (by Amygdaloideae)
Swampier Swamps (Forge) (by andrew0030)
libIPN (by mirinimi)
Lucent (by ModdingLegacy)
LibX (by noeppinoeppi)
Critters and Companions (by joosh_7889)
Integrated Stronghold- End Remastered Integration (by CraisinLord)
Botania (by Vazkii)
Just Enough Items (JEI) (by mezz)
Thermal Innovation (by TeamCoFH)
ESSENTIAL Mod (by SparkUniverse_)
Integrated API (by CraisinLord)
Auudio [Forge] (by Keksuccino)
Architectury API (Fabric/Forge) (by shedaniel)
Storage Labels (by MehVahdJukaar)
Rubidium (by Asek3)
Armor Points ++ (by CheosTwitch)
Oculus (by Asek3)
Enchantment Requirements (by TeamDman)
Create: Molten Vents (by apothicono2)
Resourceful Config (by ThatGravyBoat)
No See, No Tick (by Vishnu)
Handcrafted (by kekie6)
Almost Unified (by AlmostReliable)
Thermal Integration (by TeamCoFH)
GeckoLib (by Gecko)
YUNG's Better Dungeons (Forge) (by YUNGNICKYOUNG)
Terralith (by Starmute)
MemoryLeakFix (by FX_PR0CESS)
Domum Ornamentum (by OrionOnline)
Chunk Sending[Forge/Fabric] (by someaddon)
Block Limit Fix (by tropheusj)
Iceberg [Forge] (by Grend_G)
Common Capabilities (by kroeser)
When Dungeons Arise - Spacing Tweaks (by Aureljz)
Dungeon Crawl (by xiroc_)
YUNG's Extras (Forge) (by YUNGNICKYOUNG)
Crafting Station (by tfarecnim)
L_Ender 's Cataclysm (by mcl_ender)
MVS - Moog's Voyager Structures (by finndog_123)
Elytra Slot (Fabric/Forge/Quilt) (by TheIllusiveC4)
Clear Despawn [Forge] (by StrikerRocker)
Stylecolonies (by Raycoms)
Construction Wand (by ThetaDev)
Storage Drawers (by Texelsaur)
Chunky (Forge) (by pop4959)
Spelunking Bags (by Sweetygamer)
Compact Crafting (by RobotGryphon)
Curios API (Forge) (by TheIllusiveC4)
Visual Traveler's Titles (by un_roman)
Just Enough Professions (JEP) (by Mrbysco)
Library Ferret - Forge (by jtl_elisa)
Abundant Atmosphere (by sheddmerstk)
Sky Villages [Forge] (by y4z0n)
Mouse Tweaks (by YaLTeR)
Effective (Forge) (by BottomTextDanny)
Snow Under Trees (by bl4ckscor3)
Creeper Overhaul (by joosh_7889)
KubeJS Ars Nouveau (by BobVarioa)
Default Dark Mode (by nebulr)
Boatload (by TeamAbnormals)
Cloth Config API (Fabric/Forge) (by shedaniel)
Multi-Piston (by Raycoms)
Thermal Expansion (by TeamCoFH)
Controlling (by Jaredlll08)
Max Health Fix (by DarkhaxDev)
Applied Mekanistics (by ramidzkh)
YUNG's API (Forge) (by YUNGNICKYOUNG)
PolyLib (by Official_CreeperHost)
Unusual End (by Sweetygamer)
Ecologics (by SameDifferent)
Iris & Oculus Flywheel Compat (by leon_mout)
Farmer's Delight (by vectorwing)
ProbeJS (by Amygdaloideae)
JourneyMap (by techbrew)
Better Villages - Forge (by jtl_elisa)
Entity Collision FPS Fix (by Corgi_Taco)
Structurize (by Raycoms)
Clean Tooltips (by Stal)
Just Enough Effect Descriptions (JEED) (by MehVahdJukaar)
Soft Weather (by vectorwing)
Phantasmic (by MuffinsQw)
Ars Nouveau (by baileyholl2)
CullLessLeaves Reforged (Unofficial) (by ccr4ft3r)
SwingThroughGrass (by exidex)
Gliders (by Suff99)
AttributeFix (by DarkhaxDev)
Obscure API (Forge) (by Obscuria)
Moonlight Lib (by MehVahdJukaar)
FTB Teams (Forge) (by FTB)
Magnesium/Rubidium Extras (by Anthxny)
Mutant More (by alexandersfunandgames)
Thermal Foundation (by TeamCoFH)
Delightful (by brnbrd)
Lootr (Forge) (by Noobanidus)
Create Chunkloading (by embeddedt)
McJtyLib (by McJty)
Upgrade Aquatic (by TeamAbnormals)
In Control! (by McJty)
Item Borders [Forge] (by Grend_G)
Just Enough Sculk Sensor (by Lorexe)
Blueprint (by TeamAbnormals)
Caelus API (Forge) (by TheIllusiveC4)
YUNG's Better Nether Fortresses (Forge) (by YUNGNICKYOUNG)
FerriteCore (Forge) (by malte0811)
End Remastered (by jack_bagel)
Quark (by Vazkii)
Applied Energistics 2 (by thetechnici4n)
Just Enough Advancements (JEA) (by MelanX)
CodeChicken Lib 1.8.+ (by covers1624)
Create Slice & Dice (by possible_triangle)
Creatures and Beasts (by joosh_7889)
KubeJS Create (by LatvianModder)
PowerfulJS (by Amygdaloideae)
Alex's Mobs (by sbom_xela)
Create Style Modded Compats (by wedge1453)
Better Compatibility Checker (by Gaz_)
Ponder for KubeJS (by Lytho)
Naturalist (by Starfish_Studios)
The Bumblezone (Forge) (by telepathicgrunt)
Immersive Weathering [FORGE] (by OrdanaryMods)
Measurements (by Mrbysco)
Eccentric Tome (by EccentricVamp)
Hexerei (by JoeFoxe)
SuperMartijn642's Config Lib (by SuperMartijn642)
Thermal Locomotion (by TeamCoFH)
Cosmos Library (by TheCosmicNebula_)
FTB Quests (Forge) (by FTB)
Canary (by AbdElAziz333)
FTB Library (Forge) (by FTB)
Cyclops Core (by kroeser)
FTB Essentials (Forge) (by FTB)
Habitat (by schnappdragon)
The Abyss II - The Other Side (by y4z0n)
YUNG's Better Ocean Monuments (Forge) (by YUNGNICKYOUNG)
Kotlin for Forge (by thedarkcolour)
Saturn (by AbdElAziz333)
LootJS: KubeJS Addon (by Lytho)
Konkrete [Forge] (by Keksuccino)
Integrated Dungeons and Structures- Configuration Datapack (by CraisinLord)
Inventory Sorter (by cpw)
Stylish Effects (by Fuzs)
Starlight (Forge) (by Spottedstar)
AutoRegLib (by Vazkii)
Valhelsia Core (by ValhelsiaTeam)
Rift Realms - Core (by Ira_the_56)
Modonomicon (by kli_kli)
Global Packs (by JTK222)
Low On Fire (by Haikis)
Forge Config API Port [Fabric] (by Fuzs)
Galosphere (by orcinus73)
Rotten Creatures (by fusionstudiomc)
this is all that is in the log of note
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-2, 2], pos: BlockPos{x=-23, y=99, z=37}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-2, 2], pos: BlockPos{x=-17, y=99, z=45}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-2, 1], pos: BlockPos{x=-19, y=100, z=22}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-2, 1], pos: BlockPos{x=-22, y=100, z=28}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-1, 1], pos: BlockPos{x=-13, y=100, z=31}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-2, 2], pos: BlockPos{x=-23, y=100, z=37}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-1, 2], pos: BlockPos{x=-14, y=100, z=44}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-1, 1], pos: BlockPos{x=-5, y=101, z=25}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-1, 1], pos: BlockPos{x=-1, y=101, z=31}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-1, 2], pos: BlockPos{x=-14, y=101, z=44}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-1, 1], pos: BlockPos{x=-11, y=102, z=22}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-1, 1], pos: BlockPos{x=-5, y=102, z=25}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-1, 1], pos: BlockPos{x=-1, y=102, z=31}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-1, 2], pos: BlockPos{x=-4, y=102, z=40}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-1, 2], pos: BlockPos{x=-9, y=102, z=44}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-1, 1], pos: BlockPos{x=-11, y=103, z=22}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-1, 2], pos: BlockPos{x=-3, y=103, z=36}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-1, 2], pos: BlockPos{x=-4, y=103, z=40}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-1, 2], pos: BlockPos{x=-9, y=103, z=44}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
[14:41:51] [Worker-Main11/ERROR]: Detected setBlock in a far chunk [-1, 2], pos: BlockPos{x=-3, y=104, z=36}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / theabyss:slimed_giant_shroom]
the actual log is 4,000kb