I can provide the code in the datapack if required. Thank you

[19:41:06] [Server thread/ERROR] [minecraft/BlockableEventLoop]: Error executing task on Chunk source main thread executor for integration:z_test
net.minecraft.ReportedException: Feature placement
at net.minecraft.server.level.ChunkMap.m_214912_(ChunkMap.java:658) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {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:surveyor.mixins.json:MixinThreadedAnvilChunkStorage from mod surveyor,pl:mixin:APP:pehkui.mixins.json:compat1201minus.compat116plus.ThreadedAnvilChunkStorageMixin from mod pehkui,pl:mixin:APP:mixins.tellme.json:IMixinThreadedAnvilChunkStorage from mod tellme,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:A,pl:connector_pre_launch:A}
at net.minecraft.util.thread.BlockableEventLoop.m_6367_(BlockableEventLoop.java:156) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {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:modernfix-common.mixins.json:perf.fix_loop_spin_waiting.BlockableEventLoopMixin from mod modernfix,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.server.level.ServerChunkCache$MainThreadExecutor.m_6367_(ServerChunkCache.java:541) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:connector_pre_launch:A}
at net.minecraft.util.thread.BlockableEventLoop.m_7245_(BlockableEventLoop.java:130) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:computing_frames,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:perf.fix_loop_spin_waiting.BlockableEventLoopMixin from mod modernfix,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.server.level.ServerChunkCache$MainThreadExecutor.m_7245_(ServerChunkCache.java:549) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:connector_pre_launch:A}
at net.minecraft.util.thread.BlockableEventLoop.m_18701_(BlockableEventLoop.java:139) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {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:modernfix-common.mixins.json:perf.fix_loop_spin_waiting.BlockableEventLoopMixin from mod modernfix,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.server.level.ServerChunkCache.getChunkBlocking(ServerChunkCache.java:2268) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:cupboard.mixins.json:ChunkLoadDebug from mod cupboard,pl:mixin:APP:canary.mixins.json:alloc.chunk_ticking.ServerChunkCacheMixin from mod canary,pl:mixin:APP:canary.mixins.json:chunk.replace_streams.servercore_compat.ServerChunkCacheMixin from mod canary,pl:mixin:APP:canary.mixins.json:world.chunk_access.ServerChunkCacheMixin from mod canary,pl:mixin:APP:pehkui.mixins.json:compat1201minus.compat117plus.ServerChunkManagerMixin from mod pehkui,pl:mixin:APP:modernfix-forge.mixins.json:bugfix.chunk_deadlock.ServerChunkCache_CurrentLoadingMixin from mod modernfix,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.server.level.ServerChunkCache.m_7587_(ServerChunkCache.java:2164) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:cupboard.mixins.json:ChunkLoadDebug from mod cupboard,pl:mixin:APP:canary.mixins.json:alloc.chunk_ticking.ServerChunkCacheMixin from mod canary,pl:mixin:APP:canary.mixins.json:chunk.replace_streams.servercore_compat.ServerChunkCacheMixin from mod canary,pl:mixin:APP:canary.mixins.json:world.chunk_access.ServerChunkCacheMixin from mod canary,pl:mixin:APP:pehkui.mixins.json:compat1201minus.compat117plus.ServerChunkManagerMixin from mod pehkui,pl:mixin:APP:modernfix-forge.mixins.json:bugfix.chunk_deadlock.ServerChunkCache_CurrentLoadingMixin from mod modernfix,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.world.level.Level.m_6522_(Level.java:187) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {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:create_new_age.mixins.json:LevelMixin from mod create_new_age,pl:mixin:APP:sereneseasons.mixins.json:MixinLevel from mod sereneseasons,pl:mixin:APP:mixins.tellme.json:IMixinWorld from mod tellme,pl:mixin:APP:canary.mixins.json:alloc.chunk_random.LevelMixin from mod canary,pl:mixin:APP:canary.mixins.json:entity.collisions.intersection.LevelMixin from mod canary,pl:mixin:APP:canary.mixins.json:util.block_entity_retrieval.LevelMixin from mod canary,pl:mixin:APP:canary.mixins.json:world.block_entity_ticking.sleeping.LevelMixin from mod canary,pl:mixin:APP:canary.mixins.json:world.chunk_access.LevelMixin from mod canary,pl:mixin:APP:canary.mixins.json:world.inline_block_access.LevelMixin from mod canary,pl:mixin:APP:canary.mixins.json:world.inline_height.LevelMixin from mod canary,pl:mixin:APP:citadel.mixins.json:LevelMixin from mod citadel,pl:mixin:APP:fabric-data-attachment-api-v1.mixins.json:AttachmentTargetsMixin from mod fabric_data_attachment_api_v1,pl:mixin:APP:fabric-lifecycle-events-v1.mixins.json:WorldMixin from mod fabric_lifecycle_events_v1,pl:mixin:APP:kubejs-common.mixins.json:LevelMixin from mod kubejs,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.world.level.Level.m_6325_(Level.java:4551) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {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:create_new_age.mixins.json:LevelMixin from mod create_new_age,pl:mixin:APP:sereneseasons.mixins.json:MixinLevel from mod sereneseasons,pl:mixin:APP:mixins.tellme.json:IMixinWorld from mod tellme,pl:mixin:APP:canary.mixins.json:alloc.chunk_random.LevelMixin from mod canary,pl:mixin:APP:canary.mixins.json:entity.collisions.intersection.LevelMixin from mod canary,pl:mixin:APP:canary.mixins.json:util.block_entity_retrieval.LevelMixin from mod canary,pl:mixin:APP:canary.mixins.json:world.block_entity_ticking.sleeping.LevelMixin from mod canary,pl:mixin:APP:canary.mixins.json:world.chunk_access.LevelMixin from mod canary,pl:mixin:APP:canary.mixins.json:world.inline_block_access.LevelMixin from mod canary,pl:mixin:APP:canary.mixins.json:world.inline_height.LevelMixin from mod canary,pl:mixin:APP:citadel.mixins.json:LevelMixin from mod citadel,pl:mixin:APP:fabric-data-attachment-api-v1.mixins.json:AttachmentTargetsMixin from mod fabric_data_attachment_api_v1,pl:mixin:APP:fabric-lifecycle-events-v1.mixins.json:WorldMixin from mod fabric_lifecycle_events_v1,pl:mixin:APP:kubejs-common.mixins.json:LevelMixin from mod kubejs,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.server.level.PlayerRespawnLogic.m_183928_(PlayerRespawnLogic.java:23) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:classloading,pl:connector_pre_launch:A}
at net.minecraft.server.level.ServerPlayer.m_9201_(ServerPlayer.java:282) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:computing_frames,pl:accesstransformer:B,pl:connector_pre_launch:A,re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendisland.mixins.json:ServerPlayerMixin from mod betterendisland,pl:mixin:APP:yungsapi.mixins.json:ServerPlayerEntityTickMixin from mod yungsapi,pl:mixin:APP:surveyor.mixins.json:MixinServerPlayerEntity from mod surveyor,pl:mixin:APP:hordes.mixin.json:MixinServerPlayer from mod hordes,pl:mixin:APP:fabric-entity-events-v1.mixins.json:ServerPlayerEntityMixin from mod fabric_entity_events_v1,pl:mixin:APP:pehkui.mixins.json:ServerPlayerEntityMixin from mod pehkui,pl:mixin:APP:fabric-screen-handler-api-v1.mixins.json:ServerPlayerEntityMixin from mod fabric_screen_handler_api_v1,pl:mixin:APP:l2screentracker.mixins.json:ServerPlayerMixin from mod l2screentracker,pl:mixin:APP:beansbackpacks.mixins.json:common.ServerPlayerMixin from mod beansbackpacks,pl:mixin:APP:kubejs-common.mixins.json:ServerPlayerMixin from mod kubejs,pl:mixin:APP:betterdeserttemples.mixins.json:ServerPlayerTickMixin from mod betterdeserttemples,pl:mixin:APP:simplyswords-common.mixins.json:ServerPlayerEntityMixin from mod simplyswords,pl:mixin:APP:axiom.mixins.json:MixinServerPlayer from mod axiom,pl:mixin:APP:axiom.mixins.json:world_properties.MixinServerPlayer from mod axiom,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.server.level.ServerPlayer.(ServerPlayer.java:256) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:computing_frames,pl:accesstransformer:B,pl:connector_pre_launch:A,re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendisland.mixins.json:ServerPlayerMixin from mod betterendisland,pl:mixin:APP:yungsapi.mixins.json:ServerPlayerEntityTickMixin from mod yungsapi,pl:mixin:APP:surveyor.mixins.json:MixinServerPlayerEntity from mod surveyor,pl:mixin:APP:hordes.mixin.json:MixinServerPlayer from mod hordes,pl:mixin:APP:fabric-entity-events-v1.mixins.json:ServerPlayerEntityMixin from mod fabric_entity_events_v1,pl:mixin:APP:pehkui.mixins.json:ServerPlayerEntityMixin from mod pehkui,pl:mixin:APP:fabric-screen-handler-api-v1.mixins.json:ServerPlayerEntityMixin from mod fabric_screen_handler_api_v1,pl:mixin:APP:l2screentracker.mixins.json:ServerPlayerMixin from mod l2screentracker,pl:mixin:APP:beansbackpacks.mixins.json:common.ServerPlayerMixin from mod beansbackpacks,pl:mixin:APP:kubejs-common.mixins.json:ServerPlayerMixin from mod kubejs,pl:mixin:APP:betterdeserttemples.mixins.json:ServerPlayerTickMixin from mod betterdeserttemples,pl:mixin:APP:simplyswords-common.mixins.json:ServerPlayerEntityMixin from mod simplyswords,pl:mixin:APP:axiom.mixins.json:MixinServerPlayer from mod axiom,pl:mixin:APP:axiom.mixins.json:world_properties.MixinServerPlayer from mod axiom,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraftforge.common.util.FakePlayer.(FakePlayer.java:84) ~[forge-1.20.1-47.3.6-universal.jar%23491!/:?] {re:classloading}
at net.minecraftforge.common.util.FakePlayerFactory.lambda$get$0(FakePlayerFactory.java:38) ~[forge-1.20.1-47.3.6-universal.jar%23491!/:?] {re:classloading}
at java.util.HashMap.computeIfAbsent(HashMap.java:1220) ~[?:?] {re:mixin}
at net.minecraftforge.common.util.FakePlayerFactory.get(FakePlayerFactory.java:38) ~[forge-1.20.1-47.3.6-universal.jar%23491!/:?] {re:classloading}
at net.minecraftforge.common.util.FakePlayerFactory.getMinecraft(FakePlayerFactory.java:26) ~[forge-1.20.1-47.3.6-universal.jar%23491!/:?] {re:classloading}
at tannyjung.tht.command.CommandTHTCommand.lambda$registerCommand$3(CommandTHTCommand.java:80) ~[THT-Forge-1.20.1-6.2.7.1.jar%23470!/:?] {re:classloading}
at com.mojang.brigadier.CommandDispatcher.execute(CommandDispatcher.java:264) ~[brigadier-1.1.8.jar%23106!/:?] {}
at net.minecraft.commands.Commands.m_242674_(Commands.java:257) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:connector_pre_launch:A,re:classloading,pl:mixin:APP:cupboard.mixins.json:CommandExceptionLoggingMixin from mod cupboard,pl:mixin:APP:do_a_barrel_roll.mixins.json:CommandManagerMixin from mod do_a_barrel_roll,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.commands.Commands.m_230957_(Commands.java:237) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:connector_pre_launch:A,re:classloading,pl:mixin:APP:cupboard.mixins.json:CommandExceptionLoggingMixin from mod cupboard,pl:mixin:APP:do_a_barrel_roll.mixins.json:CommandManagerMixin from mod do_a_barrel_roll,pl:mixin:A,pl:connector_pre_launch:A}
at tannyjung.tht.procedures.StartProcedure.execute(StartProcedure.java:54) ~[THT-Forge-1.20.1-6.2.7.1.jar%23470!/:?] {re:classloading}
at tannyjung.tht.procedures.StartProcedure.onPlayerLoggedIn(StartProcedure.java:27) ~[THT-Forge-1.20.1-6.2.7.1.jar%23470!/:?] {re:classloading}
at tannyjung.tht.procedures.StartProcedure_onPlayerLoggedIn_PlayerLoggedInEvent.invoke(.dynamic) ~[THT-Forge-1.20.1-6.2.7.1.jar%23470!/:?] {re:classloading,pl:eventbus:B}
at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:73) ~[eventbus-6.0.5.jar%23137!/:?] {}
at net.minecraftforge.eventbus.EventBus.post(EventBus.java:315) ~[eventbus-6.0.5.jar%23137!/:?] {}
at net.minecraftforge.eventbus.EventBus.post(EventBus.java:296) ~[eventbus-6.0.5.jar%23137!/:?] {}
at net.minecraftforge.event.ForgeEventFactory.firePlayerLoggedIn(ForgeEventFactory.java:875) ~[forge-1.20.1-47.3.6-universal.jar%23491!/:?] {re:mixin,re:classloading,pl:mixin:APP:modernfix-forge.mixins.json:perf.potential_spawns_alloc.ForgeEventFactoryMixin from mod modernfix,pl:mixin:A}
at net.minecraft.server.players.PlayerList.m_11261(PlayerList.java:261) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:connector_pre_launch:A,re:classloading,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.server.network.ServerLoginPacketListenerImpl.m_143699(ServerLoginPacketListenerImpl.java:139) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.server.network.ServerLoginPacketListenerImpl.m_10055_(ServerLoginPacketListenerImpl.java:126) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.server.network.ServerLoginPacketListenerImpl.redirect$eep000$fabric_networking_api_v1$handlePlayerJoin(ServerLoginPacketListenerImpl.java:563) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.server.network.ServerLoginPacketListenerImpl.m_9933_(ServerLoginPacketListenerImpl.java:70) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.network.Connection.m_129483_(Connection.java:263) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.server.network.ServerConnectionListener.m_9721_(ServerConnectionListener.java:142) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:classloading,pl:connector_pre_launch:A}
at net.minecraft.server.MinecraftServer.m_5703_(MinecraftServer.java:907) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:saturn.mixins.json:allocations.server_directory.MinecraftServerMixin from mod saturn,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin from mod modernfix,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin from mod modernfix,pl:mixin:APP:surveyor.mixins.json:MixinMinecraftServer from mod surveyor,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin from mod balm,pl:mixin:APP:fabric-message-api-v1.mixins.json:MinecraftServerMixin from mod fabric_message_api_v1,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin from mod citadel,pl:mixin:APP:fabric-lifecycle-events-v1.mixins.json:MinecraftServerMixin from mod fabric_lifecycle_events_v1,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin from mod kubejs,pl:mixin:APP:kubejs-common.mixins.json:inject_resources.MinecraftServerMixin from mod kubejs,pl:mixin:APP:fabric-resource-loader-v0.mixins.json:MinecraftServerMixin from mod fabric_resource_loader_v0,pl:mixin:APP:blueprint.mixins.json:MinecraftServerMixin from mod blueprint,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.server.MinecraftServer.m_5705_(MinecraftServer.java:814) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:saturn.mixins.json:allocations.server_directory.MinecraftServerMixin from mod saturn,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin from mod modernfix,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin from mod modernfix,pl:mixin:APP:surveyor.mixins.json:MixinMinecraftServer from mod surveyor,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin from mod balm,pl:mixin:APP:fabric-message-api-v1.mixins.json:MinecraftServerMixin from mod fabric_message_api_v1,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin from mod citadel,pl:mixin:APP:fabric-lifecycle-events-v1.mixins.json:MinecraftServerMixin from mod fabric_lifecycle_events_v1,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin from mod kubejs,pl:mixin:APP:kubejs-common.mixins.json:inject_resources.MinecraftServerMixin from mod kubejs,pl:mixin:APP:fabric-resource-loader-v0.mixins.json:MinecraftServerMixin from mod fabric_resource_loader_v0,pl:mixin:APP:blueprint.mixins.json:MinecraftServerMixin from mod blueprint,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.client.server.IntegratedServer.m_5705_(IntegratedServer.java:89) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:connector_pre_launch:A,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:modernfix-common.mixins.json:perf.thread_priorities.IntegratedServerMixin from mod modernfix,pl:mixin:APP:blueprint.mixins.json:client.IntegratedServerMixin from mod blueprint,pl:mixin:APP:axiom.mixins.json:MixinIntegratedServer from mod axiom,pl:mixin:A,pl:connector_pre_launch:A,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:661) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:saturn.mixins.json:allocations.server_directory.MinecraftServerMixin from mod saturn,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin from mod modernfix,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin from mod modernfix,pl:mixin:APP:surveyor.mixins.json:MixinMinecraftServer from mod surveyor,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin from mod balm,pl:mixin:APP:fabric-message-api-v1.mixins.json:MinecraftServerMixin from mod fabric_message_api_v1,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin from mod citadel,pl:mixin:APP:fabric-lifecycle-events-v1.mixins.json:MinecraftServerMixin from mod fabric_lifecycle_events_v1,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin from mod kubejs,pl:mixin:APP:kubejs-common.mixins.json:inject_resources.MinecraftServerMixin from mod kubejs,pl:mixin:APP:fabric-resource-loader-v0.mixins.json:MinecraftServerMixin from mod fabric_resource_loader_v0,pl:mixin:APP:blueprint.mixins.json:MinecraftServerMixin from mod blueprint,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.server.MinecraftServer.m_206580_(MinecraftServer.java:251) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:saturn.mixins.json:allocations.server_directory.MinecraftServerMixin from mod saturn,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin from mod modernfix,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin from mod modernfix,pl:mixin:APP:surveyor.mixins.json:MixinMinecraftServer from mod surveyor,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin from mod balm,pl:mixin:APP:fabric-message-api-v1.mixins.json:MinecraftServerMixin from mod fabric_message_api_v1,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin from mod citadel,pl:mixin:APP:fabric-lifecycle-events-v1.mixins.json:MinecraftServerMixin from mod fabric_lifecycle_events_v1,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin from mod kubejs,pl:mixin:APP:kubejs-common.mixins.json:inject_resources.MinecraftServerMixin from mod kubejs,pl:mixin:APP:fabric-resource-loader-v0.mixins.json:MinecraftServerMixin from mod fabric_resource_loader_v0,pl:mixin:APP:blueprint.mixins.json:MinecraftServerMixin from mod blueprint,pl:mixin:A,pl:connector_pre_launch:A}
at java.lang.Thread.run(Thread.java:833) ~[?:?] {re:mixin}
Caused by: java.lang.IndexOutOfBoundsException: Index (0) is greater than or equal to list size (0)
at it.unimi.dsi.fastutil.objects.ObjectArrayList.get(ObjectArrayList.java:381) ~[fastutil-8.5.9.jar%23122!/:?] {re:mixin}
at net.minecraft.world.level.levelgen.feature.treedecorators.BeehiveDecorator.m_214187_(BeehiveDecorator.java:53) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:classloading,pl:connector_pre_launch:A}
at dev.corgitaco.ohthetreesyoullgrow.world.level.levelgen.feature.TreeFromStructureNBTFeature.placeTreeDecorations(TreeFromStructureNBTFeature.java:171) ~[Oh-The-Trees-Youll-Grow-forge-1.20.1-1.3.1.jar%23429!/:?] {re:classloading}
at dev.corgitaco.ohthetreesyoullgrow.world.level.levelgen.feature.TreeFromStructureNBTFeature.m_142674_(TreeFromStructureNBTFeature.java:115) ~[Oh-The-Trees-Youll-Grow-forge-1.20.1-1.3.1.jar%23429!/:?] {re:classloading}
at net.minecraft.world.level.levelgen.feature.Feature.m_225028_(Feature.java:155) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:classloading,pl:connector_pre_launch:A,re:mixin,pl:connector_pre_launch:A}
at net.minecraft.world.level.levelgen.feature.ConfiguredFeature.m_224953_(ConfiguredFeature.java:28) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:classloading,pl:connector_pre_launch:A}
at net.minecraft.world.level.levelgen.placement.PlacedFeature.m_226362_(PlacedFeature.java:54) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:classloading,pl:connector_pre_launch:A}
at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) ~[?:?] {}
at java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:411) ~[?:?] {}
at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762) ~[?:?] {}
at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:276) ~[?:?] {}
at java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:411) ~[?:?] {}
at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762) ~[?:?] {}
at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:276) ~[?:?] {}
at java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:411) ~[?:?] {}
at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762) ~[?:?] {}
at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:276) ~[?:?] {}
at java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:411) ~[?:?] {}
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[?:?] {}
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[?:?] {}
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[?:?] {}
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[?:?] {}
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?] {}
at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596) ~[?:?] {}
at net.minecraft.world.level.levelgen.placement.PlacedFeature.m_226368_(PlacedFeature.java:53) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:classloading,pl:connector_pre_launch:A}
at net.minecraft.world.level.levelgen.placement.PlacedFeature.m_226377_(PlacedFeature.java:42) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:classloading,pl:connector_pre_launch:A}
at net.minecraft.world.level.chunk.ChunkGenerator.m_213609_(ChunkGenerator.java:357) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {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:bettermineshafts.mixins.json:DisableVanillaMineshaftsMixin from mod bettermineshafts,pl:mixin:APP:betterjungletemples.mixins.json:DisableVanillaJungleTempleMixin from mod betterjungletemples,pl:mixin:APP:betteroceanmonuments.mixins.json:DisableVanillaMonumentsMixin from mod betteroceanmonuments,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:APP:forge-DistantHorizons.forge.mixins.json:server.MixinChunkGenerator from mod (unknown),pl:mixin:APP:forge-DistantHorizons.forge.mixins.json:server.MixinTFChunkGenerator from mod (unknown),pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.world.level.chunk.ChunkStatus.m_279978_(ChunkStatus.java:108) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:alexscaves.mixins.json:ChunkStatusMixin from mod alexscaves,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.world.level.chunk.ChunkStatus$SimpleGenerationTask.m_214024_(ChunkStatus.java:309) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:classloading,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%23486!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:alexscaves.mixins.json:ChunkStatusMixin from mod alexscaves,pl:mixin:A,pl:connector_pre_launch:A}
at net.minecraft.server.level.ChunkMap.lambda$scheduleChunkGeneration$27(ChunkMap.java:643) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:bugfix.paper_chunk_patches.ChunkMapMixin from mod modernfix,pl:mixin:APP:modernfix-forge.mixins.json:bugfix.chunk_deadlock.ChunkMapLoadMixin from mod modernfix,pl:mixin:APP:surveyor.mixins.json:MixinThreadedAnvilChunkStorage from mod surveyor,pl:mixin:APP:pehkui.mixins.json:compat1201minus.compat116plus.ThreadedAnvilChunkStorageMixin from mod pehkui,pl:mixin:APP:mixins.tellme.json:IMixinThreadedAnvilChunkStorage from mod tellme,pl:mixin:APP:fabric-networking-api-v1.mixins.json:accessor.ThreadedAnvilChunkStorageAccessor from mod fabric_networking_api_v1,pl:mixin:APP:fabric-lifecycle-events-v1.mixins.json:ThreadedAnvilChunkStorageMixin from mod fabric_lifecycle_events_v1,pl:mixin:A,pl:connector_pre_launch:A}
at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[datafixerupper-6.0.8.jar%23107!/:?] {}
at net.minecraft.server.level.ChunkMap.lambda$scheduleChunkGeneration$29(ChunkMap.java:634) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:bugfix.paper_chunk_patches.ChunkMapMixin from mod modernfix,pl:mixin:APP:modernfix-forge.mixins.json:bugfix.chunk_deadlock.ChunkMapLoadMixin from mod modernfix,pl:mixin:APP:surveyor.mixins.json:MixinThreadedAnvilChunkStorage from mod surveyor,pl:mixin:APP:pehkui.mixins.json:compat1201minus.compat116plus.ThreadedAnvilChunkStorageMixin from mod pehkui,pl:mixin:APP:mixins.tellme.json:IMixinThreadedAnvilChunkStorage from mod tellme,pl:mixin:APP:fabric-networking-api-v1.mixins.json:accessor.ThreadedAnvilChunkStorageAccessor from mod fabric_networking_api_v1,pl:mixin:APP:fabric-lifecycle-events-v1.mixins.json:ThreadedAnvilChunkStorageMixin from mod fabric_lifecycle_events_v1,pl:mixin:A,pl:connector_pre_launch:A}
at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1150) ~[?:?] {}
at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482) ~[?:?] {}
at net.minecraft.server.level.ChunkTaskPriorityQueueSorter.m_143188_(ChunkTaskPriorityQueueSorter.java:62) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:classloading,pl:connector_pre_launch:A}
at net.minecraft.util.thread.ProcessorMailbox.m_18759_(ProcessorMailbox.java:91) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:classloading,pl:connector_pre_launch:A}
at net.minecraft.util.thread.ProcessorMailbox.m_18747_(ProcessorMailbox.java:146) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:classloading,pl:connector_pre_launch:A}
at net.minecraft.util.thread.ProcessorMailbox.run(ProcessorMailbox.java:102) ~[client-1.20.1-20230612.114412-srg.jar%23486!/:?] {re:classloading,pl:connector_pre_launch:A}
at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1395) ~[?:?] {}
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?] {}
at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?] {}
at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?] {re:mixin,re:computing_frames}
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?] {re:mixin,re:computing_frames}
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?] {re:mixin}

Oh, it's also a beehives issue! I have this issue too, just posted it.