[20:25:46 ERROR]: [MythicMobs] [EVENTS] Exception thrown whilst handling event: org.bukkit.event.player.PlayerJoinEvent
[20:25:46 WARN]: java.lang.ClassCastException: class java.lang.Integer cannot be cast to class net.minecraft.network.NetworkManager (java.lang.Integer is in module java.base of loader 'bootstrap'; net.minecraft.network.NetworkManager is in unnamed module of loader java.net.URLClassLoader @5ce65a89)
[20:25:46 WARN]:        at MythicMobs-5.4.0-SNAPSHOT.jar//io.lumine.mythic.core.volatilecode.v1_20_R2.VolatilePacketHandlerImpl.injectPlayer(VolatilePacketHandlerImpl.java:52)
[20:25:46 WARN]:        at MythicMobs-5.4.0-SNAPSHOT.jar//io.lumine.mythic.core.volatilecode.v1_20_R2.VolatilePacketHandlerImpl.lambda$new$0(VolatilePacketHandlerImpl.java:42)
[20:25:46 WARN]:        at MythicMobs-5.4.0-SNAPSHOT.jar//io.lumine.mythic.bukkit.utils.Delegates$ConsumerToBiConsumerSecond.accept(Delegates.java:144)
[20:25:46 WARN]:        at MythicMobs-5.4.0-SNAPSHOT.jar//io.lumine.mythic.bukkit.utils.events.functional.single.EventListener.execute(EventListener.java:131)
[20:25:46 WARN]:        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:77)
[20:25:46 WARN]:        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70)
[20:25:46 WARN]:        at io.papermc.paper.plugin.manager.PaperEventManager.callEvent(PaperEventManager.java:54)
[20:25:46 WARN]:        at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.callEvent(PaperPluginManagerImpl.java:126)
[20:25:46 WARN]:        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:615)
[20:25:46 WARN]:        at net.minecraft.server.players.PlayerList.a(PlayerList.java:325)
[20:25:46 WARN]:        at net.minecraft.server.network.ServerConfigurationPacketListenerImpl.a(ServerConfigurationPacketListenerImpl.java:130)
[20:25:46 WARN]:        at net.minecraft.network.protocol.configuration.ServerboundFinishConfigurationPacket.a(ServerboundFinishConfigurationPacket.java:18)
[20:25:46 WARN]:        at net.minecraft.network.protocol.configuration.ServerboundFinishConfigurationPacket.a(ServerboundFinishConfigurationPacket.java:9)
[20:25:46 WARN]:        at net.minecraft.network.protocol.PlayerConnectionUtils.lambda$ensureRunningOnSameThread$0(PlayerConnectionUtils.java:53)
[20:25:46 WARN]:        at net.minecraft.server.TickTask.run(TickTask.java:18)
[20:25:46 WARN]:        at net.minecraft.util.thread.IAsyncTaskHandler.d(IAsyncTaskHandler.java:153)
[20:25:46 WARN]:        at net.minecraft.util.thread.IAsyncTaskHandlerReentrant.d(IAsyncTaskHandlerReentrant.java:24)
[20:25:46 WARN]:        at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1324)
[20:25:46 WARN]:        at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:193)
[20:25:46 WARN]:        at net.minecraft.util.thread.IAsyncTaskHandler.x(IAsyncTaskHandler.java:126)
[20:25:46 WARN]:        at net.minecraft.server.MinecraftServer.bg(MinecraftServer.java:1301)
[20:25:46 WARN]:        at net.minecraft.server.MinecraftServer.x(MinecraftServer.java:1294)
[20:25:46 WARN]:        at net.minecraft.util.thread.IAsyncTaskHandler.c(IAsyncTaskHandler.java:136)
[20:25:46 WARN]:        at net.minecraft.server.MinecraftServer.u_(MinecraftServer.java:1272)
[20:25:46 WARN]:        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1160)
[20:25:46 WARN]:        at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:315)
[20:25:46 WARN]:        at java.base/java.lang.Thread.run(Thread.java:833)