Worldedit crashing the server when typing /schematic load on Folia

[GoiseKiller]

WorldEdit Version

7.4.2

Platform Version

Paper Folia 1.21.11

Confirmations

• I am using the most recent Minecraft release.
• I am using a version of WorldEdit compatible with my Minecraft version.
• I am using the latest or recommended version of my platform software.
• I am NOT using a hybrid server, e.g. a server that combines Bukkit and Forge. Examples include Arclight, Mohist, and Cardboard.
• I am NOT using a fork of WorldEdit, such as FastAsyncWorldEdit (FAWE) or AsyncWorldEdit (AWE)

Bug Description

Server crashing after the plugin tries to pass AsyncTabCompleteEvent but fails because of java.lang.IllegalArgumentException: End must be greater than or equal to start.

Expected Behavior

Server not crashing

Reproduction Steps

1. Load a server running on Folia 1.21.11
2. Type /schematic load
   Unsure if there has to be a schematic file inside schematics directory for this to occur ^

Anything Else?

Used to use https://github.com/Euphillya/WorldEdit-Folia before Folia was officially supported and that fork also has the same issue. This issue did not exist on 1.21.8

[GoiseKiller]

If needed

// Would you like a cupcake?

Time: 2026-04-05 01:03:39
Description: Region Crash

java.lang.IllegalArgumentException: End must be greater than or equal to start
	at com.google.common.base.Preconditions.checkArgument(Preconditions.java:141)
	at worldedit-bukkit-7.4.2.jar//com.sk89q.worldedit.internal.util.Substring.wrap(Substring.java:52)
	at worldedit-bukkit-7.4.2.jar//com.sk89q.worldedit.internal.command.CommandUtil.onlyOnLastQuotedWord(CommandUtil.java:235)
	at worldedit-bukkit-7.4.2.jar//com.sk89q.worldedit.internal.command.CommandUtil.lambda$fixSuggestions$9(CommandUtil.java:217)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:215)
	at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1716)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:570)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:560)
	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:265)
	at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:727)
	at worldedit-bukkit-7.4.2.jar//com.sk89q.worldedit.internal.command.CommandUtil.fixSuggestions(CommandUtil.java:221)
	at worldedit-bukkit-7.4.2.jar//com.sk89q.worldedit.bukkit.WorldEditPlugin.onTabComplete(WorldEditPlugin.java:402)
	at worldedit-bukkit-7.4.2.jar//com.sk89q.bukkit.util.DynamicPluginCommand.tabComplete(DynamicPluginCommand.java:85)
	at org.bukkit.command.Command.tabComplete(Command.java:100)
	at io.papermc.paper.command.brigadier.bukkit.BukkitCommandNode$BukkitBrigSuggestionProvider.getSuggestions(BukkitCommandNode.java:109)
	at com.mojang.brigadier.tree.ArgumentCommandNode.listSuggestions(ArgumentCommandNode.java:71)
	at com.mojang.brigadier.CommandDispatcher.getCompletionSuggestions(CommandDispatcher.java:550)
	at com.mojang.brigadier.CommandDispatcher.getCompletionSuggestions(CommandDispatcher.java:530)
	at net.minecraft.server.network.ServerGamePacketListenerImpl.sendServerSuggestions(ServerGamePacketListenerImpl.java:948)
	at net.minecraft.server.network.ServerGamePacketListenerImpl.lambda$handleCustomCommandSuggestions0$2(ServerGamePacketListenerImpl.java:907)
	at io.papermc.paper.threadedregions.EntityScheduler.executeTick(EntityScheduler.java:243)
	at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1656)
	at net.minecraft.server.dedicated.DedicatedServer.tickServer(DedicatedServer.java:466)
	at io.papermc.paper.threadedregions.TickRegions$ConcreteRegionTickHandle.tickRegion(TickRegions.java:513)
	at io.papermc.paper.threadedregions.TickRegionScheduler$RegionScheduleHandle.runTick(TickRegionScheduler.java:533)
	at ca.spottedleaf.concurrentutil.scheduler.EDFSchedulerThreadPool$TickThreadRunner.run(EDFSchedulerThreadPool.java:526)
	at java.base/java.lang.Thread.run(Thread.java:1447)


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

-- Head --
Thread: Folia Region Scheduler Thread #1
Stacktrace:
	at com.google.common.base.Preconditions.checkArgument(Preconditions.java:141)
	at worldedit-bukkit-7.4.2.jar//com.sk89q.worldedit.internal.util.Substring.wrap(Substring.java:52)
	at worldedit-bukkit-7.4.2.jar//com.sk89q.worldedit.internal.command.CommandUtil.onlyOnLastQuotedWord(CommandUtil.java:235)
	at worldedit-bukkit-7.4.2.jar//com.sk89q.worldedit.internal.command.CommandUtil.lambda$fixSuggestions$9(CommandUtil.java:217)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:215)
	at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1716)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:570)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:560)
	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:265)
	at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:727)
	at worldedit-bukkit-7.4.2.jar//com.sk89q.worldedit.internal.command.CommandUtil.fixSuggestions(CommandUtil.java:221)
	at worldedit-bukkit-7.4.2.jar//com.sk89q.worldedit.bukkit.WorldEditPlugin.onTabComplete(WorldEditPlugin.java:402)
	at worldedit-bukkit-7.4.2.jar//com.sk89q.bukkit.util.DynamicPluginCommand.tabComplete(DynamicPluginCommand.java:85)
	at org.bukkit.command.Command.tabComplete(Command.java:100)
	at io.papermc.paper.command.brigadier.bukkit.BukkitCommandNode$BukkitBrigSuggestionProvider.getSuggestions(BukkitCommandNode.java:109)
	at com.mojang.brigadier.tree.ArgumentCommandNode.listSuggestions(ArgumentCommandNode.java:71)
	at com.mojang.brigadier.CommandDispatcher.getCompletionSuggestions(CommandDispatcher.java:550)
	at com.mojang.brigadier.CommandDispatcher.getCompletionSuggestions(CommandDispatcher.java:530)
	at net.minecraft.server.network.ServerGamePacketListenerImpl.sendServerSuggestions(ServerGamePacketListenerImpl.java:948)
	at net.minecraft.server.network.ServerGamePacketListenerImpl.lambda$handleCustomCommandSuggestions0$2(ServerGamePacketListenerImpl.java:907)
	at io.papermc.paper.threadedregions.EntityScheduler.executeTick(EntityScheduler.java:243)
	at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1656)
	at net.minecraft.server.dedicated.DedicatedServer.tickServer(DedicatedServer.java:466)

-- Region Context --
Details:
	Executing Tasks: false
	RegionScheduleHandle: ThreadedRegion{state=2,sectionCount=25,sections=[RegionSection{sectionCoordinate=[6, 137],chunkCount=0,chunksBitset=0000000000000000000000000000000000000000000000000000000000000000,nonEmptyNeighbours=1,hash=407489894},RegionSection{sectionCoordinate=[10, 138],chunkCount=0,chunksBitset=0000000000000000000000000000000000000000000000000000000000000000,nonEmptyNeighbours=2,hash=1945357566},RegionSection{sectionCoordinate=[6, 141],chunkCount=0,chunksBitset=0000000000000000000000000000000000000000000000000000000000000000,nonEmptyNeighbours=1,hash=864363468},RegionSection{sectionCoordinate=[7, 137],chunkCount=0,chunksBitset=0000000000000000000000000000000000000000000000000000000000000000,nonEmptyNeighbours=2,hash=1263674383},RegionSection{sectionCoordinate=[7, 141],chunkCount=0,chunksBitset=0000000000000000000000000000000000000000000000000000000000000000,nonEmptyNeighbours=2,hash=1452363639},RegionSection{sectionCoordinate=[9, 138],chunkCount=187,chunksBitset=07ff0000000000007fff3fff3fff1fff7fff7fff7fff7fff7fff7fff7fff7fff,nonEmptyNeighbours=3,hash=1005120871},RegionSection{sectionCoordinate=[9, 137],chunkCount=0,chunksBitset=0000000000000000000000000000000000000000000000000000000000000000,nonEmptyNeighbours=2,hash=560538261},RegionSection{sectionCoordinate=[9, 139],chunkCount=240,chunksBitset=7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff7fff,nonEmptyNeighbours=5,hash=2076252395},RegionSection{sectionCoordinate=[8, 137],chunkCount=0,chunksBitset=0000000000000000000000000000000000000000000000000000000000000000,nonEmptyNeighbours=3,hash=670501395},RegionSection{sectionCoordinate=[10, 140],chunkCount=0,chunksBitset=0000000000000000000000000000000000000000000000000000000000000000,nonEmptyNeighbours=2,hash=1535658079},RegionSection{sectionCoordinate=[8, 141],chunkCount=0,chunksBitset=0000000000000000000000000000000000000000000000000000000000000000,nonEmptyNeighbours=3,hash=857584689},RegionSection{sectionCoordinate=[8, 139],chunkCount=256,chunksBitset=ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff,nonEmptyNeighbours=8,hash=1080616185},RegionSection{sectionCoordinate=[6, 140],chunkCount=0,chunksBitset=0000000000000000000000000000000000000000000000000000000000000000,nonEmptyNeighbours=2,hash=1607518581},RegionSection{sectionCoordinate=[6, 138],chunkCount=0,chunksBitset=0000000000000000000000000000000000000000000000000000000000000000,nonEmptyNeighbours=2,hash=1174644832},RegionSection{sectionCoordinate=[7, 139],chunkCount=96,chunksBitset=fc00fc00fc00fc00fc00fc00fc00fc00fc00fc00fc00fc00fc00fc00fc00fc00,nonEmptyNeighbours=5,hash=417411245},RegionSection{sectionCoordinate=[7, 138],chunkCount=70,chunksBitset=c000000000000000fc00f800f800f000fc00fc00fc00fc00fc00fc00fc00fc00,nonEmptyNeighbours=3,hash=522797156},RegionSection{sectionCoordinate=[7, 140],chunkCount=40,chunksBitset=fc00fc00fc00fc00c000f000f800f80000000000000000000000000000000000,nonEmptyNeighbours=3,hash=1189853589},RegionSection{sectionCoordinate=[9, 140],chunkCount=114,chunksBitset=7fff7fff7fff7fff0fff1fff3fff7fff00000000000000000000000000000000,nonEmptyNeighbours=3,hash=493902208},RegionSection{sectionCoordinate=[9, 141],chunkCount=0,chunksBitset=0000000000000000000000000000000000000000000000000000000000000000,nonEmptyNeighbours=2,hash=210073307},RegionSection{sectionCoordinate=[8, 140],chunkCount=128,chunksBitset=ffffffffffffffffffffffffffffffff00000000000000000000000000000000,nonEmptyNeighbours=5,hash=1509571919},RegionSection{sectionCoordinate=[10, 137],chunkCount=0,chunksBitset=0000000000000000000000000000000000000000000000000000000000000000,nonEmptyNeighbours=1,hash=1120272628},RegionSection{sectionCoordinate=[8, 138],chunkCount=209,chunksBitset=ffff000000000001ffffffffffffffffffffffffffffffffffffffffffffffff,nonEmptyNeighbours=5,hash=1566961013},RegionSection{sectionCoordinate=[10, 141],chunkCount=0,chunksBitset=0000000000000000000000000000000000000000000000000000000000000000,nonEmptyNeighbours=1,hash=2054257580},RegionSection{sectionCoordinate=[10, 139],chunkCount=0,chunksBitset=0000000000000000000000000000000000000000000000000000000000000000,nonEmptyNeighbours=3,hash=1927881192},RegionSection{sectionCoordinate=[6, 139],chunkCount=0,chunksBitset=0000000000000000000000000000000000000000000000000000000000000000,nonEmptyNeighbours=3,hash=5922529}]}
Stacktrace:
	at io.papermc.paper.threadedregions.TickRegionScheduler.regionFailed(TickRegionScheduler.java:284)
	at io.papermc.paper.threadedregions.TickRegionScheduler$RegionScheduleHandle.runTick(TickRegionScheduler.java:535)
	at ca.spottedleaf.concurrentutil.scheduler.EDFSchedulerThreadPool$TickThreadRunner.run(EDFSchedulerThreadPool.java:526)
	at java.base/java.lang.Thread.run(Thread.java:1447)```

[octylFractal]

This might be EngineHub/Piston#46.