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1.20.1 Client crashing when joining the ender portal

Posted 4 hours ago4 hr

Hi! I apologize for posting two threads back to back, but this is a separate problem that was referenced in my other thread.
Whenever I enter an ender portal in the custom modpack I'm playing, the game crashes. Usually, it gives me the response 'Description: Exception generating new chunk'
I attempted to open a world in which I was already in the end, to which it gave me the crash 'Description: Exception ticking world'

I've attached the most recent crash report below.
Now, I will say that the crash report points out several mods in the notes, but I've tested out removing all of them and they don't solve the issue.
Specifically, removing Supplementaries and Nostalgia Tweaks does nothing to address the issue
The blueprint library mod specifically gets zeroed out, but it is required for some of the major mods in my modpack.
Perhaps, then, I will have to just swallow my pride and avoid the end dimension for this modpack
But I was wondering if anyone had any tips
Thank you :)

Recent Crash Report

---- Minecraft Crash Report ----

// Hi. I'm Connector, and I'm a crashaholic

=========================

SINYTRA CONNECTOR IS PRESENT!

Please verify issues are not caused by Connector before reporting them to mod authors.

If you're unsure, file a report on Connector's issue tracker found at https://github.com/Sinytra/Connector/issues.

=========================

// Embeddium instance tainted by mods: [supplementaries, nostalgic_tweaks]

// Please do not reach out for Embeddium support without removing these mods first.

// -------

// Who set us up the TNT?

Time: 2025-10-25 19:39:03

Description: Exception generating new chunk

java.lang.IllegalStateException: Trying to access unbound value 'ResourceKey[minecraft:worldgen/biome / minecraft:the_end]' from registry net.minecraft.core.RegistrySetBuilder$CompositeOwner@6489ee3f

at net.minecraft.core.Holder$Reference.m_203334_(Holder.java:147) ~[client-1.20.1-20230612.114412-srg.jar%23789!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:computing_frames,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:mixins.brb-common.json:accessors.HolderReferenceAccessor from mod brb,pl:mixin:A,pl:connector_pre_launch:A}

at com.teamabnormals.blueprint.common.world.modification.ModdedBiomeSource.getSlice(ModdedBiomeSource.java:95) ~[blueprint-1.20.1-7.1.3.jar%23516!/:7.1.3] {re:classloading}

at com.teamabnormals.blueprint.common.world.modification.ModdedBiomeSource.m_203407_(ModdedBiomeSource.java:71) ~[blueprint-1.20.1-7.1.3.jar%23516!/:7.1.3] {re:classloading}

at net.minecraft.world.level.levelgen.structure.Structure.m_262828_(Structure.java:108) ~[client-1.20.1-20230612.114412-srg.jar%23789!/:?] {re:mixin,xf:fml:forge:structure,pl:connector_pre_launch:A,re:classloading,xf:fml:forge:structure,pl:mixin:APP:mixins.unusualend.json:StructuresMixin from mod unusualend,pl:mixin:A,pl:connector_pre_launch:A}

at net.minecraft.world.level.levelgen.structure.Structure.m_262787_(Structure.java:157) ~[client-1.20.1-20230612.114412-srg.jar%23789!/:?] {re:mixin,xf:fml:forge:structure,pl:connector_pre_launch:A,re:classloading,xf:fml:forge:structure,pl:mixin:APP:mixins.unusualend.json:StructuresMixin from mod unusualend,pl:mixin:A,pl:connector_pre_launch:A}

at java.util.Optional.filter(Unknown Source) ~[?:?] {re:mixin}

at net.minecraft.world.level.levelgen.structure.Structure.m_262864_(Structure.java:156) ~[client-1.20.1-20230612.114412-srg.jar%23789!/:?] {re:mixin,xf:fml:forge:structure,pl:connector_pre_launch:A,re:classloading,xf:fml:forge:structure,pl:mixin:APP:mixins.unusualend.json:StructuresMixin from mod unusualend,pl:mixin:A,pl:connector_pre_launch:A}

at net.minecraft.world.level.levelgen.structure.Structure.m_226596_(Structure.java:86) ~[client-1.20.1-20230612.114412-srg.jar%23789!/:?] {re:mixin,xf:fml:forge:structure,pl:connector_pre_launch:A,re:classloading,xf:fml:forge:structure,pl:mixin:APP:mixins.unusualend.json:StructuresMixin from mod unusualend,pl:mixin:A,pl:connector_pre_launch:A}

at net.minecraft.world.level.chunk.ChunkGenerator.m_223104_(ChunkGenerator.java:513) ~[client-1.20.1-20230612.114412-srg.jar%23789!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterfortresses.mixins.json:DisableVanillaFortressesMixin from mod betterfortresses,pl:mixin:APP:betterjungletemples.mixins.json:DisableVanillaJungleTempleMixin from mod betterjungletemples,pl:mixin:APP:betteroceanmonuments.mixins.json:DisableVanillaMonumentsMixin from mod betteroceanmonuments,pl:mixin:APP:tide.mixins.json:ChunkGenMixin from mod tide,pl:mixin:APP:bettermineshafts.mixins.json:DisableVanillaMineshaftsMixin from mod bettermineshafts,pl:mixin:APP:betterwitchhuts.mixins.json:DisableVanillaWitchHutsMixin from mod betterwitchhuts,pl:mixin:APP:citadel.mixins.json:ChunkGeneratorMixin from mod citadel,pl:mixin:APP:betterstrongholds.mixins.json:DisableVanillaStrongholdsMixin from mod betterstrongholds,pl:mixin:APP:betterdeserttemples.mixins.json:DisableVanillaPyramidsMixin from mod betterdeserttemples,pl:mixin:A,pl:connector_pre_launch:A}

at net.minecraft.world.level.chunk.ChunkGenerator.m_254811_(ChunkGenerator.java:466) ~[client-1.20.1-20230612.114412-srg.jar%23789!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterfortresses.mixins.json:DisableVanillaFortressesMixin from mod betterfortresses,pl:mixin:APP:betterjungletemples.mixins.json:DisableVanillaJungleTempleMixin from mod betterjungletemples,pl:mixin:APP:betteroceanmonuments.mixins.json:DisableVanillaMonumentsMixin from mod betteroceanmonuments,pl:mixin:APP:tide.mixins.json:ChunkGenMixin from mod tide,pl:mixin:APP:bettermineshafts.mixins.json:DisableVanillaMineshaftsMixin from mod bettermineshafts,pl:mixin:APP:betterwitchhuts.mixins.json:DisableVanillaWitchHutsMixin from mod betterwitchhuts,pl:mixin:APP:citadel.mixins.json:ChunkGeneratorMixin from mod citadel,pl:mixin:APP:betterstrongholds.mixins.json:DisableVanillaStrongholdsMixin from mod betterstrongholds,pl:mixin:APP:betterdeserttemples.mixins.json:DisableVanillaPyramidsMixin from mod betterdeserttemples,pl:mixin:A,pl:connector_pre_launch:A}

at java.lang.Iterable.forEach(Unknown Source) ~[?:?] {re:mixin}

at net.minecraft.world.level.chunk.ChunkGenerator.m_255037_(ChunkGenerator.java:448) ~[client-1.20.1-20230612.114412-srg.jar%23789!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterfortresses.mixins.json:DisableVanillaFortressesMixin from mod betterfortresses,pl:mixin:APP:betterjungletemples.mixins.json:DisableVanillaJungleTempleMixin from mod betterjungletemples,pl:mixin:APP:betteroceanmonuments.mixins.json:DisableVanillaMonumentsMixin from mod betteroceanmonuments,pl:mixin:APP:tide.mixins.json:ChunkGenMixin from mod tide,pl:mixin:APP:bettermineshafts.mixins.json:DisableVanillaMineshaftsMixin from mod bettermineshafts,pl:mixin:APP:betterwitchhuts.mixins.json:DisableVanillaWitchHutsMixin from mod betterwitchhuts,pl:mixin:APP:citadel.mixins.json:ChunkGeneratorMixin from mod citadel,pl:mixin:APP:betterstrongholds.mixins.json:DisableVanillaStrongholdsMixin from mod betterstrongholds,pl:mixin:APP:betterdeserttemples.mixins.json:DisableVanillaPyramidsMixin from mod betterdeserttemples,pl:mixin:A,pl:connector_pre_launch:A}

at net.minecraft.world.level.chunk.ChunkStatus.m_289181_(ChunkStatus.java:54) ~[client-1.20.1-20230612.114412-srg.jar%23789!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:connector_pre_launch:A}

at net.minecraft.world.level.chunk.ChunkStatus.m_280308_(ChunkStatus.java:252) ~[client-1.20.1-20230612.114412-srg.jar%23789!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:connector_pre_launch:A}

at net.minecraft.server.level.ChunkMap.lambda$scheduleChunkGeneration$27(ChunkMap.java:643) ~[client-1.20.1-20230612.114412-srg.jar%23789!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:bugfix.paper_chunk_patches.ChunkMapMixin from mod modernfix,pl:mixin:APP:modernfix-forge.mixins.json:bugfix.chunk_deadlock.ChunkMapLoadMixin from mod modernfix,pl:mixin:APP:lithium.mixins.json:world.player_chunk_tick.ThreadedAnvilChunkStorageMixin from mod radium,pl:mixin:APP:enhancedcelestials.mixins.json:access.ChunkMapAccess from mod enhancedcelestials,pl:mixin:APP:dataanchor-common.mixins.json:ChunkMapMixin from mod dataanchor,pl:mixin:APP:surveyor.mixins.json:MixinThreadedAnvilChunkStorage from mod surveyor,pl:mixin:APP:fabric-networking-api-v1.mixins.json:accessor.ThreadedAnvilChunkStorageAccessor from mod fabric_networking_api_v1,pl:mixin:APP:fabric-lifecycle-events-v1.mixins.json:ThreadedAnvilChunkStorageMixin from mod fabric_lifecycle_events_v1,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.square_border.ChunkMapMixin from mod nostalgic_tweaks,pl:mixin:A,pl:connector_pre_launch:A}

at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[datafixerupper-6.0.8.jar%2395!/:?] {}

at net.minecraft.server.level.ChunkMap.lambda$scheduleChunkGeneration$29(ChunkMap.java:634) ~[client-1.20.1-20230612.114412-srg.jar%23789!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:bugfix.paper_chunk_patches.ChunkMapMixin from mod modernfix,pl:mixin:APP:modernfix-forge.mixins.json:bugfix.chunk_deadlock.ChunkMapLoadMixin from mod modernfix,pl:mixin:APP:lithium.mixins.json:world.player_chunk_tick.ThreadedAnvilChunkStorageMixin from mod radium,pl:mixin:APP:enhancedcelestials.mixins.json:access.ChunkMapAccess from mod enhancedcelestials,pl:mixin:APP:dataanchor-common.mixins.json:ChunkMapMixin from mod dataanchor,pl:mixin:APP:surveyor.mixins.json:MixinThreadedAnvilChunkStorage from mod surveyor,pl:mixin:APP:fabric-networking-api-v1.mixins.json:accessor.ThreadedAnvilChunkStorageAccessor from mod fabric_networking_api_v1,pl:mixin:APP:fabric-lifecycle-events-v1.mixins.json:ThreadedAnvilChunkStorageMixin from mod fabric_lifecycle_events_v1,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.square_border.ChunkMapMixin from mod nostalgic_tweaks,pl:mixin:A,pl:connector_pre_launch:A}

at java.util.concurrent.CompletableFuture$UniCompose.tryFire(Unknown Source) ~[?:?] {}

at java.util.concurrent.CompletableFuture$Completion.run(Unknown Source) ~[?:?] {}

at net.minecraft.server.level.ChunkTaskPriorityQueueSorter.m_143188_(ChunkTaskPriorityQueueSorter.java:62) ~[client-1.20.1-20230612.114412-srg.jar%23789!/:?] {re:classloading,pl:connector_pre_launch:A}

at net.minecraft.util.thread.ProcessorMailbox.m_18759_(ProcessorMailbox.java:91) ~[client-1.20.1-20230612.114412-srg.jar%23789!/:?] {re:classloading,pl:connector_pre_launch:A}

at net.minecraft.util.thread.ProcessorMailbox.m_18747_(ProcessorMailbox.java:146) ~[client-1.20.1-20230612.114412-srg.jar%23789!/:?] {re:classloading,pl:connector_pre_launch:A}

at net.minecraft.util.thread.ProcessorMailbox.run(ProcessorMailbox.java:102) ~[client-1.20.1-20230612.114412-srg.jar%23789!/:?] {re:classloading,pl:connector_pre_launch:A}

at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(Unknown Source) ~[?:?] {}

at java.util.concurrent.ForkJoinTask.doExec(Unknown Source) ~[?:?] {}

at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(Unknown Source) ~[?:?] {}

at java.util.concurrent.ForkJoinPool.scan(Unknown Source) ~[?:?] {re:mixin,re:computing_frames}

at java.util.concurrent.ForkJoinPool.runWorker(Unknown Source) ~[?:?] {re:mixin,re:computing_frames}

at java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source) ~[?:?] {re:mixin}

A detailed walkthrough of the error, its code path and all known details is as follows:

---------------------------------------------------------------------------------------

-- Head --

Thread: Server thread

Suspected Mod:

Blueprint (blueprint), Version: 7.1.3

Issue tracker URL: https://github.com/team-abnormals/blueprint/issues

at TRANSFORMER/[email protected]/com.teamabnormals.blueprint.common.world.modification.ModdedBiomeSource.getSlice(ModdedBiomeSource.java:95)

Stacktrace:

at com.teamabnormals.blueprint.common.world.modification.ModdedBiomeSource.getSlice(ModdedBiomeSource.java:95) ~[blueprint-1.20.1-7.1.3.jar%23516!/:7.1.3] {re:classloading}

at com.teamabnormals.blueprint.common.world.modification.ModdedBiomeSource.m_203407_(ModdedBiomeSource.java:71) ~[blueprint-1.20.1-7.1.3.jar%23516!/:7.1.3] {re:classloading}

at java.util.Optional.filter(Unknown Source) ~[?:?] {re:mixin}

-- Chunk to be generated --

Details:

Location: 2,0

Position hash: 2

Generator: net.minecraft.world.level.levelgen.NoiseBasedChunkGenerator@2811db40