when breaking portal the inside material stays as ghost

Could not pass event BlockBreakEvent to Dimensions v3.1.1-DEMO
java.lang.NullPointerException: Cannot invoke "io.netty.channel.Channel.attr(io.netty.util.AttributeKey)" because "channel" is null
at com.comphenix.protocol.injector.netty.channel.NettyChannelInjector.findInjector(NettyChannelInjector.java:160) ~[ProtocolLib.jar:?]
at com.comphenix.protocol.injector.netty.channel.InjectionFactory.fromPlayer(InjectionFactory.java:103) ~[ProtocolLib.jar:?]
at com.comphenix.protocol.injector.netty.manager.NetworkManagerPlayerInjector.sendServerPacket(NetworkManagerPlayerInjector.java:59) ~[ProtocolLib.jar:?]
at com.comphenix.protocol.injector.PacketFilterManager.sendServerPacket(PacketFilterManager.java:181) ~[ProtocolLib.jar:?]
at com.comphenix.protocol.injector.PacketFilterManager.sendServerPacket(PacketFilterManager.java:154) ~[ProtocolLib.jar:?]
at com.comphenix.protocol.injector.PacketFilterManager.sendServerPacket(PacketFilterManager.java:149) ~[ProtocolLib.jar:?]
at com.comphenix.protocol.injector.PacketFilterManager.broadcastServerPacket(PacketFilterManager.java:293) ~[ProtocolLib.jar:?]
at com.comphenix.protocol.injector.PacketFilterManager.broadcastServerPacket(PacketFilterManager.java:252) ~[ProtocolLib.jar:?]
at com.comphenix.packetwrapper.AbstractPacket.broadcastPacket(AbstractPacket.java:79) ~[Dimensions-DEMO.jar:?]
at me.xxastaspastaxx.dimensions.completePortal.PortalEntitySand.destroyBroadcast(PortalEntitySand.java:114) ~[Dimensions-DEMO.jar:?]
at me.xxastaspastaxx.dimensions.completePortal.CompletePortal.destroy(CompletePortal.java:596) ~[Dimensions-DEMO.jar:?]
at me.xxastaspastaxx.dimensions.completePortal.CompletePortalManager.removePortal(CompletePortalManager.java:227) ~[Dimensions-DEMO.jar:?]
at me.xxastaspastaxx.dimensions.listener.PortalListener.onBlockChange(PortalListener.java:365) ~[Dimensions-DEMO.jar:?]
at me.xxastaspastaxx.dimensions.listener.PortalListener.onBlockChange(PortalListener.java:355) ~[Dimensions-DEMO.jar:?]
at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor168.execute(Unknown Source) ~[?:?]
at org.bukkit.plugin.EventExecutor.lambda$create$1(EventExecutor.java:75) ~[purpur-api-1.19.2-R0.1-SNAPSHOT.jar:?]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[purpur-api-1.19.2-R0.1-SNAPSHOT.jar:git-Purpur-1843]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[purpur-api-1.19.2-R0.1-SNAPSHOT.jar:?]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:678) ~[purpur-api-1.19.2-R0.1-SNAPSHOT.jar:?]
at net.minecraft.server.level.ServerPlayerGameMode.destroyBlock(ServerPlayerGameMode.java:369) ~[?:?]
at net.minecraft.server.level.ServerPlayerGameMode.destroyAndAck(ServerPlayerGameMode.java:328) ~[?:?]
at net.minecraft.server.level.ServerPlayerGameMode.handleBlockBreakAction(ServerPlayerGameMode.java:214) ~[?:?]
at net.minecraft.server.network.ServerGamePacketListenerImpl.handlePlayerAction(ServerGamePacketListenerImpl.java:1965) ~[?:?]
at net.minecraft.network.protocol.game.ServerboundPlayerActionPacket.handle(ServerboundPlayerActionPacket.java:42) ~[?:?]
at net.minecraft.network.protocol.game.ServerboundPlayerActionPacket.a(ServerboundPlayerActionPacket.java:15) ~[?:?]
at net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$0(PacketUtils.java:51) ~[?:?]
at net.minecraft.server.TickTask.run(TickTask.java:18) ~[purpur-1.19.2.jar:git-Purpur-1843]
at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:153) ~[?:?]
at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24) ~[?:?]
at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1368) ~[purpur-1.19.2.jar:git-Purpur-1843]
at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:185) ~[purpur-1.19.2.jar:git-Purpur-1843]
at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:126) ~[?:?]
at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1345) ~[purpur-1.19.2.jar:git-Purpur-1843]
at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1338) ~[purpur-1.19.2.jar:git-Purpur-1843]
at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:136) ~[?:?]
at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:1316) ~[purpur-1.19.2.jar:git-Purpur-1843]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1204) ~[purpur-1.19.2.jar:git-Purpur-1843]
at net.minecraft.server.MinecraftServer.lambda$spin$1(MinecraftServer.java:310) ~[purpur-1.19.2.jar:git-Purpur-1843]
at java.lang.Thread.run(Thread.java:833) ~[?:?]

on paper
[15:44:01 ERROR]: Could not pass event BlockBreakEvent to Dimensions v3.1.1-DEMO
java.lang.NullPointerException: Cannot invoke "io.netty.channel.Channel.attr(io.netty.util.AttributeKey)" because "channel" is null
at com.comphenix.protocol.injector.netty.channel.NettyChannelInjector.findInjector(NettyChannelInjector.java:160) ~[ProtocolLib.jar:?]
at com.comphenix.protocol.injector.netty.channel.InjectionFactory.fromPlayer(InjectionFactory.java:103) ~[ProtocolLib.jar:?]
at com.comphenix.protocol.injector.netty.manager.NetworkManagerPlayerInjector.sendServerPacket(NetworkManagerPlayerInjector.java:59) ~[ProtocolLib.jar:?]
at com.comphenix.protocol.injector.PacketFilterManager.sendServerPacket(PacketFilterManager.java:181) ~[ProtocolLib.jar:?]
at com.comphenix.protocol.injector.PacketFilterManager.sendServerPacket(PacketFilterManager.java:154) ~[ProtocolLib.jar:?]
at com.comphenix.protocol.injector.PacketFilterManager.sendServerPacket(PacketFilterManager.java:149) ~[ProtocolLib.jar:?]
at com.comphenix.protocol.injector.PacketFilterManager.broadcastServerPacket(PacketFilterManager.java:293) ~[ProtocolLib.jar:?]
at com.comphenix.protocol.injector.PacketFilterManager.broadcastServerPacket(PacketFilterManager.java:252) ~[ProtocolLib.jar:?]
at com.comphenix.packetwrapper.AbstractPacket.broadcastPacket(AbstractPacket.java:79) ~[Dimensions-DEMO.jar:?]
at me.xxastaspastaxx.dimensions.completePortal.PortalEntitySand.destroyBroadcast(PortalEntitySand.java:114) ~[Dimensions-DEMO.jar:?]
at me.xxastaspastaxx.dimensions.completePortal.CompletePortal.destroy(CompletePortal.java:596) ~[Dimensions-DEMO.jar:?]
at me.xxastaspastaxx.dimensions.completePortal.CompletePortalManager.removePortal(CompletePortalManager.java:227) ~[Dimensions-DEMO.jar:?]
at me.xxastaspastaxx.dimensions.listener.PortalListener.onBlockChange(PortalListener.java:365) ~[Dimensions-DEMO.jar:?]
at me.xxastaspastaxx.dimensions.listener.PortalListener.onBlockChange(PortalListener.java:355) ~[Dimensions-DEMO.jar:?]
at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor175.execute(Unknown Source) ~[?:?]
at org.bukkit.plugin.EventExecutor.lambda$create$1(EventExecutor.java:75) ~[paper-api-1.19.2-R0.1-SNAPSHOT.jar:?]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[paper-api-1.19.2-R0.1-SNAPSHOT.jar:git-Paper-271]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[paper-api-1.19.2-R0.1-SNAPSHOT.jar:?]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:670) ~[paper-api-1.19.2-R0.1-SNAPSHOT.jar:?]
at net.minecraft.server.level.ServerPlayerGameMode.destroyBlock(ServerPlayerGameMode.java:369) ~[?:?]
at net.minecraft.server.level.ServerPlayerGameMode.destroyAndAck(ServerPlayerGameMode.java:328) ~[?:?]
at net.minecraft.server.level.ServerPlayerGameMode.handleBlockBreakAction(ServerPlayerGameMode.java:214) ~[?:?]
at net.minecraft.server.network.ServerGamePacketListenerImpl.handlePlayerAction(ServerGamePacketListenerImpl.java:1883) ~[?:?]
at net.minecraft.network.protocol.game.ServerboundPlayerActionPacket.handle(ServerboundPlayerActionPacket.java:42) ~[?:?]
at net.minecraft.network.protocol.game.ServerboundPlayerActionPacket.a(ServerboundPlayerActionPacket.java:15) ~[?:?]
at net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$1(PacketUtils.java:51) ~[?:?]
at net.minecraft.server.TickTask.run(TickTask.java:18) ~[paper-1.19.2.jar:git-Paper-271]
at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:153) ~[?:?]
at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24) ~[?:?]
at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1341) ~[paper-1.19.2.jar:git-Paper-271]
at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:185) ~[paper-1.19.2.jar:git-Paper-271]
at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:126) ~[?:?]
at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1318) ~[paper-1.19.2.jar:git-Paper-271]
at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1311) ~[paper-1.19.2.jar:git-Paper-271]
at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:136) ~[?:?]
at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:1289) ~[paper-1.19.2.jar:git-Paper-271]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1177) ~[paper-1.19.2.jar:git-Paper-271]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:305) ~[paper-1.19.2.jar:git-Paper-271]
at java.lang.Thread.run(Thread.java:833) ~[?:?]

Can you please tell me what version is your minecraft server?
Also please make sure that you are using the latest version of ProtocolLib

current purpur-1.19.2 build 1843
tested paper-1.19.2 build 265
latest protocollib build 602 https://ci.dmulloy2.net/job/ProtocolLib/602/

same issue on both server forks

Using the latest spigot build for 1.19.2, the plugin seems to be working fine.
The same error would pop while using older versions of ProtocolLib or after using the /reload command
Make sure you are using the latest build for protocolib by re-installing and also make sure you are using the latest build for paper
Unfortunately Dimensions is a spigot plugin and i wont be focusing on fixing problems that appear on paper builds.
If Dimensions keeps throwing this error even if you use spigot, please let me know

spigot-1.19.2
[Server thread/ERROR]: Could not pass event BlockBreakEvent to Dimensions v3.1.1-DEMO
org.bukkit.event.EventException: null
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot-api-1.19.2-R0.1-SNAPSHOT.jar:?]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[spigot-api-1.19.2-R0.1-SNAPSHOT.jar:?]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:589) ~[spigot-api-1.19.2-R0.1-SNAPSHOT.jar:?]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:576) ~[spigot-api-1.19.2-R0.1-SNAPSHOT.jar:?]
at net.minecraft.server.level.PlayerInteractManager.a(PlayerInteractManager.java:352) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3607-Spigot-6198b5a-e7aab54]
at net.minecraft.server.level.PlayerInteractManager.a(PlayerInteractManager.java:311) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3607-Spigot-6198b5a-e7aab54]
at net.minecraft.server.level.PlayerInteractManager.a(PlayerInteractManager.java:201) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3607-Spigot-6198b5a-e7aab54]
at net.minecraft.server.network.PlayerConnection.a(PlayerConnection.java:1586) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3607-Spigot-6198b5a-e7aab54]
at net.minecraft.network.protocol.game.PacketPlayInBlockDig.a(SourceFile:42) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3607-Spigot-6198b5a-e7aab54]
at net.minecraft.network.protocol.game.PacketPlayInBlockDig.a(SourceFile:8) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3607-Spigot-6198b5a-e7aab54]
at net.minecraft.network.protocol.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:31) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3607-Spigot-6198b5a-e7aab54]
at net.minecraft.server.TickTask.run(SourceFile:18) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3607-Spigot-6198b5a-e7aab54]
at net.minecraft.util.thread.IAsyncTaskHandler.d(SourceFile:157) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3607-Spigot-6198b5a-e7aab54]
at net.minecraft.util.thread.IAsyncTaskHandlerReentrant.d(SourceFile:23) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3607-Spigot-6198b5a-e7aab54]
at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1150) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3607-Spigot-6198b5a-e7aab54]
at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:1) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3607-Spigot-6198b5a-e7aab54]
at net.minecraft.util.thread.IAsyncTaskHandler.x(SourceFile:131) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3607-Spigot-6198b5a-e7aab54]
at net.minecraft.server.MinecraftServer.bh(MinecraftServer.java:1129) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3607-Spigot-6198b5a-e7aab54]
at net.minecraft.server.MinecraftServer.x(MinecraftServer.java:1122) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3607-Spigot-6198b5a-e7aab54]
at net.minecraft.util.thread.IAsyncTaskHandler.c(SourceFile:140) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3607-Spigot-6198b5a-e7aab54]
at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1106) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3607-Spigot-6198b5a-e7aab54]
at net.minecraft.server.MinecraftServer.v(MinecraftServer.java:1017) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3607-Spigot-6198b5a-e7aab54]
at net.minecraft.server.MinecraftServer.lambda$0(MinecraftServer.java:293) ~[spigot-1.19.2-R0.1-SNAPSHOT.jar:3607-Spigot-6198b5a-e7aab54]
at java.lang.Thread.run(Thread.java:833) [?:?]
Caused by: java.lang.NullPointerException: Cannot invoke "io.netty.channel.Channel.attr(io.netty.util.AttributeKey)" because "channel" is null
at com.comphenix.protocol.injector.netty.channel.NettyChannelInjector.findInjector(NettyChannelInjector.java:160) ~[?:?]
at com.comphenix.protocol.injector.netty.channel.InjectionFactory.fromPlayer(InjectionFactory.java:103) ~[?:?]
at com.comphenix.protocol.injector.netty.manager.NetworkManagerPlayerInjector.sendServerPacket(NetworkManagerPlayerInjector.java:59) ~[?:?]
at com.comphenix.protocol.injector.PacketFilterManager.sendServerPacket(PacketFilterManager.java:181) ~[?:?]
at com.comphenix.protocol.injector.PacketFilterManager.sendServerPacket(PacketFilterManager.java:154) ~[?:?]
at com.comphenix.protocol.injector.PacketFilterManager.sendServerPacket(PacketFilterManager.java:149) ~[?:?]
at com.comphenix.protocol.injector.PacketFilterManager.broadcastServerPacket(PacketFilterManager.java:293) ~[?:?]
at com.comphenix.protocol.injector.PacketFilterManager.broadcastServerPacket(PacketFilterManager.java:252) ~[?:?]
at com.comphenix.packetwrapper.AbstractPacket.broadcastPacket(AbstractPacket.java:79) ~[?:?]
at me.xxastaspastaxx.dimensions.completePortal.PortalEntitySand.destroyBroadcast(PortalEntitySand.java:114) ~[?:?]
at me.xxastaspastaxx.dimensions.completePortal.CompletePortal.destroy(CompletePortal.java:596) ~[?:?]
at me.xxastaspastaxx.dimensions.completePortal.CompletePortalManager.removePortal(CompletePortalManager.java:227) ~[?:?]
at me.xxastaspastaxx.dimensions.listener.PortalListener.onBlockChange(PortalListener.java:365) ~[?:?]
at me.xxastaspastaxx.dimensions.listener.PortalListener.onBlockChange(PortalListener.java:355) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot-api-1.19.2-R0.1-SNAPSHOT.jar:?]
... 23 more

I have been trying to find a solution for a few hours. But I can't understand what is the problem. And it could either be something wrong in the code or a few settings in your server, or even hardware.

The error is happening when the plugin tries to despawn the falling block entities inside the portal.

A temporary workaround until a solution has been found is to use NON-SOLID blocks, like water, lava, etc for the inside of the portal. (Nether portal is a NON-SOLID block but Dimensions will behave as if it is solid)

I will keep trying to figure out what's going wrong, but like I said, I have only seen this error in protocolLib when using the /reload command or when I use oldest versions of the plugin. If it is in fact ProtocolLib's fault, then you may want to seek help there as well. (Maybe they know what's wrong)
(The reason I suspect it might be ProtocolLib or server settings is because I saw reports of the same error for 2 different plugins by the same person.)