UnsupportedOperationException in Paper 1.20.6

[MineFact]

Paper and Spigot 1.20.6 are requiring a higher Java version than before.
I am using Java 22 right now.

Whenever I try to reload a plugin using /pm reload <name> i get this error:

[19:05:12 WARN]: java.lang.UnsupportedOperationException: remove
[19:05:12 WARN]:        at java.base/java.util.Iterator.remove(Iterator.java:102)
[19:05:12 WARN]:        at PluginManager.jar//net.lenni0451.spm.utils.PluginUtils.unloadPlugin(PluginUtils.java:382)
[19:05:12 WARN]:        at PluginManager.jar//net.lenni0451.spm.commands.subs.Reload_Sub.execute(Reload_Sub.java:31)
[19:05:12 WARN]:        at PluginManager.jar//net.lenni0451.spm.commands.PluginManager_Command.lambda$onCommand$0(PluginManager_Command.java:94)
[19:05:12 WARN]:        at PluginManager.jar//net.lenni0451.spm.commands.PluginManager_Command.onCommand(PluginManager_Command.java:110)
[19:05:12 WARN]:        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45)
[19:05:12 WARN]:        at io.papermc.paper.command.brigadier.bukkit.BukkitCommandNode$BukkitBrigCommand.run(BukkitCommandNode.java:86)
[19:05:12 WARN]:        at com.mojang.brigadier.context.ContextChain.runExecutable(ContextChain.java:73)
[19:05:12 WARN]:        at net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:31)
[19:05:12 WARN]:        at net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:19)
[19:05:12 WARN]:        at net.minecraft.commands.execution.UnboundEntryAction.lambda$bind$0(UnboundEntryAction.java:8)
[19:05:12 WARN]:        at net.minecraft.commands.execution.CommandQueueEntry.execute(CommandQueueEntry.java:5)
[19:05:12 WARN]:        at net.minecraft.commands.execution.ExecutionContext.runCommandQueue(ExecutionContext.java:103)
[19:05:12 WARN]:        at net.minecraft.commands.Commands.executeCommandInContext(Commands.java:442)
[19:05:12 WARN]:        at net.minecraft.commands.Commands.performCommand(Commands.java:349)
[19:05:12 WARN]:        at net.minecraft.commands.Commands.performCommand(Commands.java:336)
[19:05:12 WARN]:        at net.minecraft.commands.Commands.performCommand(Commands.java:331)
[19:05:12 WARN]:        at net.minecraft.server.network.ServerGamePacketListenerImpl.performUnsignedChatCommand(ServerGamePacketListenerImpl.java:2202)
[19:05:12 WARN]:        at net.minecraft.server.network.ServerGamePacketListenerImpl.lambda$handleChatCommand$14(ServerGamePacketListenerImpl.java:2176)
[19:05:12 WARN]:        at net.minecraft.server.TickTask.run(TickTask.java:18)
[19:05:12 WARN]:        at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:151)
[19:05:12 WARN]:        at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24)
[19:05:12 WARN]:        at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1511)
[19:05:12 WARN]:        at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:195)
[19:05:12 WARN]:        at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:125)
[19:05:12 WARN]:        at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1488)
[19:05:12 WARN]:        at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1411)
[19:05:12 WARN]:        at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:135)
[19:05:12 WARN]:        at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:1377)
[19:05:12 WARN]:        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1238)
[19:05:12 WARN]:        at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:323)
[19:05:12 WARN]:        at java.base/java.lang.Thread.run(Thread.java:1570)