weird unload 1

Event: QUEUE_UNLOAD   Order: 0   Reason: UNKNOWN (look at stacktrace)
net.minecraft.world.gen.ChunkProviderServer.queueUnload(ChunkProviderServer.java:75)
carpet.utils.UnloadOrder.test_save_chunks(UnloadOrder.java:50)
carpet.commands.CommandUnload.a(CommandUnload.java:107)
net.minecraft.command.CommandHandler.tryExecute(CommandHandler.java:130)
net.minecraft.command.CommandHandler.executeCommand(CommandHandler.java:97)
net.minecraft.network.NetHandlerPlayServer.handleSlashCommand(NetHandlerPlayServer.java:1016)
net.minecraft.network.NetHandlerPlayServer.processChatMessage(NetHandlerPlayServer.java:994)
net.minecraft.network.play.client.CPacketChatMessage.processPacket(CPacketChatMessage.java:37)
net.minecraft.network.play.client.CPacketChatMessage.processPacket(CPacketChatMessage.java:9)
net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:13)
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
java.util.concurrent.FutureTask.run(FutureTask.java:266)
net.minecraft.util.Util.runTask(Util.java:21)
net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:807)
net.minecraft.server.dedicated.DedicatedServer.updateTimeLightAndEntities(DedicatedServer.java:406)
net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:739)
net.minecraft.server.MinecraftServer.run(MinecraftServer.java:595)
java.lang.Thread.run(Thread.java:748)

Event: CANCEL_UNLOAD   Order: 1   Reason: Queued block event: minecraft:sticky_piston[extended=false,facing=north]
net.minecraft.world.gen.ChunkProviderServer.getLoadedChunk(ChunkProviderServer.java:109)
net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:121)
net.minecraft.world.gen.ChunkProviderServer.provideChunk(ChunkProviderServer.java:148)
net.minecraft.world.World.getChunkFromChunkCoords(World.java:366)
net.minecraft.world.World.getChunkFromBlockCoords(World.java:358)
net.minecraft.world.World.getBlockState(World.java:990)
net.minecraft.world.WorldServer.fireBlockEvent(WorldServer.java:1340)
net.minecraft.world.WorldServer.sendQueuedBlockEvents(WorldServer.java:1327)
net.minecraft.world.WorldServer.tick(WorldServer.java:275)
net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:833)
net.minecraft.server.dedicated.DedicatedServer.updateTimeLightAndEntities(DedicatedServer.java:406)
net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:739)
net.minecraft.server.MinecraftServer.run(MinecraftServer.java:595)
java.lang.Thread.run(Thread.java:748)