1.21.1 Neoforge Crash

[DraGonFiirE]

Opening and closing the LittleTiles blueprint GUI in quick succession crashes the client with the stacktrace referencing Dynamic Surroundings

Relevant stacktrace:

Description: Unexpected error

java.util.ConcurrentModificationException: null
	at java.base/java.util.HashMap$HashIterator.nextNode(Unknown Source) ~[?:?] {}
	at java.base/java.util.HashMap$KeyIterator.next(Unknown Source) ~[?:?] {}
	at TRANSFORMER/dsurround@0.4.2/org.orecruncher.dsurround.eventing.handlers.BlockUpdateHandler.expand(BlockUpdateHandler.java:60) ~[dynamicsurroundings-neoforge-1.21.1-0.4.2.jar%23212!/:?] {re:mixin,re:classloading}
	at TRANSFORMER/dsurround@0.4.2/org.orecruncher.dsurround.eventing.handlers.BlockUpdateHandler.tick(BlockUpdateHandler.java:47) ~[dynamicsurroundings-neoforge-1.21.1-0.4.2.jar%23212!/:?] {re:mixin,re:classloading}
	at TRANSFORMER/dsurround@0.4.2/org.orecruncher.dsurround.eventing.ClientState.lambda$static$6(ClientState.java:48) ~[dynamicsurroundings-neoforge-1.21.1-0.4.2.jar%23212!/:?] {re:mixin,re:classloading}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.client.Minecraft.handler$bhc000$dsurround$tickEnd(Minecraft.java:8014) ~[client-1.21.1-20240808.144430-srg.jar%23207!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:connector_pre_launch:A,pl:runtimedistcleaner:A}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.client.Minecraft.tick(Minecraft.java:1916) ~[client-1.21.1-20240808.144430-srg.jar%23207!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:connector_pre_launch:A,pl:runtimedistcleaner:A}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.client.Minecraft.runTick(Minecraft.java:1161) ~[client-1.21.1-20240808.144430-srg.jar%23207!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:connector_pre_launch:A,pl:runtimedistcleaner:A}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.client.Minecraft.run(Minecraft.java:807) ~[client-1.21.1-20240808.144430-srg.jar%23207!/:?] {re:mixin,pl:accesstransformer:B,pl:connector_pre_launch:A,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:connector_pre_launch:A,pl:runtimedistcleaner:A}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.client.main.Main.main(Main.java:230) ~[client-1.21.1-20240808.144430-srg.jar%23207!/:?] {re:classloading,pl:connector_pre_launch:A,pl:runtimedistcleaner:A}
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source) ~[?:?] {}
	at java.base/java.lang.reflect.Method.invoke(Unknown Source) ~[?:?] {re:mixin}
	at MC-BOOTSTRAP/fml_loader@4.0.42/net.neoforged.fml.loading.targets.CommonLaunchHandler.runTarget(CommonLaunchHandler.java:136) ~[loader-4.0.42.jar%23107!/:4.0] {}
	at MC-BOOTSTRAP/fml_loader@4.0.42/net.neoforged.fml.loading.targets.CommonLaunchHandler.clientService(CommonLaunchHandler.java:124) ~[loader-4.0.42.jar%23107!/:4.0] {}
	at MC-BOOTSTRAP/fml_loader@4.0.42/net.neoforged.fml.loading.targets.CommonClientLaunchHandler.runService(CommonClientLaunchHandler.java:32) ~[loader-4.0.42.jar%23107!/:4.0] {}
	at MC-BOOTSTRAP/fml_loader@4.0.42/net.neoforged.fml.loading.targets.CommonLaunchHandler.lambda$launchService$4(CommonLaunchHandler.java:118) ~[loader-4.0.42.jar%23107!/:4.0] {}
	at MC-BOOTSTRAP/cpw.mods.modlauncher@11.0.5/cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:30) [modlauncher-11.0.5.jar%23112!/:?] {}
	at MC-BOOTSTRAP/cpw.mods.modlauncher@11.0.5/cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) [modlauncher-11.0.5.jar%23112!/:?] {}
	at MC-BOOTSTRAP/cpw.mods.modlauncher@11.0.5/cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) [modlauncher-11.0.5.jar%23112!/:?] {}
	at MC-BOOTSTRAP/cpw.mods.modlauncher@11.0.5/cpw.mods.modlauncher.Launcher.run(Launcher.java:103) [modlauncher-11.0.5.jar%23112!/:?] {}
	at MC-BOOTSTRAP/cpw.mods.modlauncher@11.0.5/cpw.mods.modlauncher.Launcher.main(Launcher.java:74) [modlauncher-11.0.5.jar%23112!/:?] {}
	at MC-BOOTSTRAP/cpw.mods.modlauncher@11.0.5/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) [modlauncher-11.0.5.jar%23112!/:?] {}
	at MC-BOOTSTRAP/cpw.mods.modlauncher@11.0.5/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) [modlauncher-11.0.5.jar%23112!/:?] {}
	at cpw.mods.bootstraplauncher@2.0.2/cpw.mods.bootstraplauncher.BootstrapLauncher.run(BootstrapLauncher.java:210) [bootstraplauncher-2.0.2.jar:?] {}
	at cpw.mods.bootstraplauncher@2.0.2/cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:69) [bootstraplauncher-2.0.2.jar:?] {}

crash-2026-04-12_21.45.13-client.txt
blueprint.txt

Dynamicsurroundings-neoforge-1.21.1-0.4.2
Architectury-13.0.8-neoforge
CreativeCore_NEOFORGE_v2.13.36_mc1.21.1
LittleTiles_BETA_v1.6.0-pre213_mc1.21.1
Kirosblocks-1.3.0
Neoforge 21.1.219