When can we expect to see 1.21.4 support?

Sorry it took me a minute to get back to you!

I am running the latest build of world guard. I made sure to update before posting this.
[14:06:14 ERROR]: [VeinMiner] Error initializing plugin 'VeinMiner-Bukkit-2.2.6-1736459719422.jar' in folder 'plugins/.paper-remapped/unknown-origin' (Is it up to date?) java.lang.IllegalStateException: New flags cannot be registered at this time at worldguard-bukkit-7.0.13-SNAPSHOT-dist-1736460359019.jar/com.sk89q.worldguard.protection.flags.registry.SimpleFlagRegistry.register(SimpleFlagRegistry.java:60) ~[worldguard-bukkit-7.0.13-SNAPSHOT-dist-1736460359019.jar:?] at VeinMiner-Bukkit-2.2.6-1736459719422.jar/wtf.choco.veinminer.integration.WorldGuardIntegration.registerFlag(WorldGuardIntegration.java:70) ~[VeinMiner-Bukkit-2.2.6-1736459719422.jar:?] at VeinMiner-Bukkit-2.2.6-1736459719422.jar/wtf.choco.veinminer.integration.WorldGuardIntegration.init(WorldGuardIntegration.java:38) ~[VeinMiner-Bukkit-2.2.6-1736459719422.jar:?] at VeinMiner-Bukkit-2.2.6-1736459719422.jar/wtf.choco.veinminer.VeinMinerPlugin.onLoad(VeinMinerPlugin.java:115) ~[VeinMiner-Bukkit-2.2.6-1736459719422.jar:?] at io.papermc.paper.plugin.storage.ServerPluginProviderStorage.processProvided(ServerPluginProviderStorage.java:59) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at io.papermc.paper.plugin.manager.SingularRuntimePluginProviderStorage.processProvided(SingularRuntimePluginProviderStorage.java:62) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at io.papermc.paper.plugin.manager.SingularRuntimePluginProviderStorage.processProvided(SingularRuntimePluginProviderStorage.java:24) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at io.papermc.paper.plugin.storage.SimpleProviderStorage.enter(SimpleProviderStorage.java:39) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at io.papermc.paper.plugin.manager.SingularRuntimePluginProviderStorage.enter(SingularRuntimePluginProviderStorage.java:57) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at io.papermc.paper.plugin.manager.RuntimePluginEntrypointHandler.enter(RuntimePluginEntrypointHandler.java:40) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.loadPlugin(PaperPluginInstanceManager.java:116) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[?:?] at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[?:?] at PlugManX-2.4.1.jar/com.rylinaux.plugman.pluginmanager.PaperPluginManager.load(PaperPluginManager.java:399) ~[PlugManX-2.4.1.jar:?] at PlugManX-2.4.1.jar/com.rylinaux.plugman.command.LoadCommand.execute(LoadCommand.java:114) ~[PlugManX-2.4.1.jar:?] at PlugManX-2.4.1.jar/com.rylinaux.plugman.PlugManCommandHandler.onCommand(PlugManCommandHandler.java:94) ~[PlugManX-2.4.1.jar:?] at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[paper-api-1.21.4-R0.1-SNAPSHOT.jar:?] at io.papermc.paper.command.brigadier.bukkit.BukkitCommandNode$BukkitBrigCommand.run(BukkitCommandNode.java:82) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at com.mojang.brigadier.context.ContextChain.runExecutable(ContextChain.java:73) ~[brigadier-1.3.10.jar:?] at net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:30) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:13) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.commands.execution.UnboundEntryAction.lambda$bind$0(UnboundEntryAction.java:8) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.commands.execution.CommandQueueEntry.execute(CommandQueueEntry.java:5) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.commands.execution.ExecutionContext.runCommandQueue(ExecutionContext.java:105) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.commands.Commands.executeCommandInContext(Commands.java:435) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.commands.Commands.performCommand(Commands.java:342) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.commands.Commands.performCommand(Commands.java:332) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.commands.Commands.performCommand(Commands.java:326) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.server.network.ServerGamePacketListenerImpl.performUnsignedChatCommand(ServerGamePacketListenerImpl.java:2197) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.server.network.ServerGamePacketListenerImpl.lambda$handleChatCommand$11(ServerGamePacketListenerImpl.java:2170) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.server.TickTask.run(TickTask.java:18) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:155) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1448) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:176) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:129) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1428) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1422) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:139) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.server.MinecraftServer.managedBlock(MinecraftServer.java:1379) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:1387) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1264) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:310) ~[paper-1.21.4.jar:1.21.4-41-d85d318] at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]

[14:06:14 INFO]: [VeinMiner] Loading server plugin VeinMiner v2.2.6
[14:06:14 INFO]: [VeinMiner] Found WorldGuard. Registering custom region flag.
[14:06:14 ERROR]: [VeinMiner] Error initializing plugin 'VeinMiner-Bukkit-2.2.6-1736459719422.jar' in folder 'plugins/.paper-remapped/unknown-origin' (Is it up to date?)

Figured this was useful as well

It should support 1.21.4 already. Are you getting errors? Fabric? Plugin?

Seems you're using a reload command (from PlugMan), which yeah, has undefined behaviour such as this. There's not much I can do to fix this, unfortunately.

You are correct! I was finally able to load it on proper boot at its working