src/main/java/StevenDimDoors/mod_pocketDim/blocks/BlockLimbo.java

@@ -9,7 +9,7 @@ import net.minecraft.util.Icon;
 import net.minecraft.world.IBlockAccess;
 import net.minecraft.world.World;
 import StevenDimDoors.mod_pocketDim.mod_pocketDim;
-import StevenDimDoors.mod_pocketDim.ticking.LimboDecay;
+import StevenDimDoors.mod_pocketDim.world.LimboDecay;
 import cpw.mods.fml.relauncher.Side;
 import cpw.mods.fml.relauncher.SideOnly;
 

src/main/java/StevenDimDoors/mod_pocketDim/helpers/ChunkLoaderHelper.java

@@ -83,7 +83,7 @@ public class ChunkLoaderHelper implements LoadingCallback
 		}
 	}
 
-	public static void loadChunkForcedWorlds(FMLServerStartingEvent event)
+	public static void loadForcedChunkWorlds(FMLServerStartingEvent event)
 	{
 		for (NewDimData data : PocketManager.getDimensions())
 		{

src/main/java/StevenDimDoors/mod_pocketDim/mod_pocketDim.java

@@ -54,7 +54,7 @@ import StevenDimDoors.mod_pocketDim.items.ItemWorldThread;
 import StevenDimDoors.mod_pocketDim.items.itemRiftRemover;
 import StevenDimDoors.mod_pocketDim.ticking.CustomLimboPopulator;
 import StevenDimDoors.mod_pocketDim.ticking.FastRiftRegenerator;
-import StevenDimDoors.mod_pocketDim.ticking.LimboDecay;
+import StevenDimDoors.mod_pocketDim.ticking.LimboDecayScheduler;
 import StevenDimDoors.mod_pocketDim.ticking.MobMonolith;
 import StevenDimDoors.mod_pocketDim.ticking.RiftRegenerator;
 import StevenDimDoors.mod_pocketDim.ticking.ServerTickHandler;
@@ -65,6 +65,7 @@ import StevenDimDoors.mod_pocketDim.tileentities.TileEntityTransTrapdoor;
 import StevenDimDoors.mod_pocketDim.world.BiomeGenLimbo;
 import StevenDimDoors.mod_pocketDim.world.BiomeGenPocket;
 import StevenDimDoors.mod_pocketDim.world.DDBiomeGenBase;
+import StevenDimDoors.mod_pocketDim.world.LimboDecay;
 import StevenDimDoors.mod_pocketDim.world.LimboProvider;
 import StevenDimDoors.mod_pocketDim.world.PocketProvider;
 import StevenDimDoors.mod_pocketDim.world.gateways.GatewayGenerator;
@@ -142,9 +143,13 @@ public class mod_pocketDim
 	public static DDProperties properties;
 	public static DDWorldProperties worldProperties;
 	public static CustomLimboPopulator spawner; //Added this field temporarily. Will be refactored out later.
+	private static RiftRegenerator riftRegenerator;
 	public static FastRiftRegenerator fastRiftRegenerator;
 	public static GatewayGenerator gatewayGenerator;
 	public static DeathTracker deathTracker;
+	private static ServerTickHandler serverTickHandler;
+	private static LimboDecayScheduler limboDecayScheduler;
+	private static LimboDecay limboDecay;
 	private static EventHookContainer hooks;
 	
 	//TODO this is a temporary workaround for saving data
@@ -182,16 +187,14 @@ public class mod_pocketDim
 	@EventHandler
 	public void onInitialization(FMLInitializationEvent event)
 	{
-		ServerTickHandler commonTickHandler = new ServerTickHandler();
-		TickRegistry.registerTickHandler(commonTickHandler, Side.SERVER);
+		// Initialize ServerTickHandler instance
+		serverTickHandler = new ServerTickHandler();
+		TickRegistry.registerTickHandler(serverTickHandler, Side.SERVER);
 		
-		//MonolithSpawner should be initialized before any provider instances are created
-		//Register the other regular tick receivers as well
-		spawner = new CustomLimboPopulator(commonTickHandler, properties);
-		new RiftRegenerator(commonTickHandler); //No need to store the reference
-		LimboDecay decay = new LimboDecay(commonTickHandler, properties);
-		fastRiftRegenerator = new FastRiftRegenerator(commonTickHandler);
+		// Initialize LimboDecay instance: required for BlockLimbo
+		limboDecay = new LimboDecay(properties);
 
+		// Initialize blocks and items
 		transientDoor = new TransientDoor(properties.TransientDoorID, Material.iron, properties).setHardness(1.0F) .setUnlocalizedName("transientDoor");
 		goldenDimensionalDoor = new BlockGoldDimDoor(properties.GoldenDimensionalDoorID, Material.iron, properties).setHardness(1.0F) .setUnlocalizedName("dimDoorGold");
 
@@ -200,7 +203,7 @@ public class mod_pocketDim
 		blockDimWallPerm = (new BlockDimWallPerm(properties.PermaFabricBlockID, 0, Material.iron)).setLightValue(1.0F).setBlockUnbreakable().setResistance(6000000.0F).setUnlocalizedName("blockDimWallPerm");
 		warpDoor = new WarpDoor(properties.WarpDoorID, Material.wood, properties).setHardness(1.0F) .setUnlocalizedName("dimDoorWarp");
 		blockRift = (BlockRift) (new BlockRift(properties.RiftBlockID, 0, Material.air, properties).setHardness(1.0F) .setUnlocalizedName("rift"));
-		blockLimbo = new BlockLimbo(properties.LimboBlockID, 15, Material.iron, properties.LimboDimensionID, decay).setHardness(.2F).setUnlocalizedName("BlockLimbo").setLightValue(.0F);
+		blockLimbo = new BlockLimbo(properties.LimboBlockID, 15, Material.iron, properties.LimboDimensionID, limboDecay).setHardness(.2F).setUnlocalizedName("BlockLimbo").setLightValue(.0F);
 		unstableDoor = (new UnstableDoor(properties.UnstableDoorID, Material.iron, properties).setHardness(.2F).setUnlocalizedName("chaosDoor").setLightValue(.0F) );
 		dimensionalDoor = (DimensionalDoor) (new DimensionalDoor(properties.DimensionalDoorID, Material.iron, properties).setHardness(1.0F).setResistance(2000.0F) .setUnlocalizedName("dimDoor"));
 		transTrapdoor = (TransTrapdoor) (new TransTrapdoor(properties.TransTrapdoorID, Material.wood).setHardness(1.0F) .setUnlocalizedName("dimHatch"));
@@ -317,7 +320,11 @@ public class mod_pocketDim
 			deathTracker.writeToFile();
 			deathTracker = null;
 			worldProperties = null;
-			this.currrentSaveRootDirectory=null;
+			currrentSaveRootDirectory = null;
+			
+			// Unregister all tick receivers from serverTickHandler to avoid leaking
+			// scheduled tasks between single-player game sessions
+			serverTickHandler.unregisterReceivers();
 		}
 		catch (Exception e)
 		{
@@ -336,6 +343,13 @@ public class mod_pocketDim
 		
 		// Initialize a new DeathTracker
 		deathTracker = new DeathTracker(currrentSaveRootDirectory + "/DimensionalDoors/data/deaths.txt");
+		
+		// Register regular tick receivers
+		// CustomLimboPopulator should be initialized before any provider instances are created
+		spawner = new CustomLimboPopulator(serverTickHandler, properties);
+		riftRegenerator = new RiftRegenerator(serverTickHandler);
+		limboDecayScheduler = new LimboDecayScheduler(serverTickHandler, limboDecay);
+		fastRiftRegenerator = new FastRiftRegenerator(serverTickHandler);
 	}
 
 	@EventHandler
@@ -353,7 +367,7 @@ public class mod_pocketDim
 		
 		try
 		{
-			ChunkLoaderHelper.loadChunkForcedWorlds(event);
+			ChunkLoaderHelper.loadForcedChunkWorlds(event);
 		}
 		catch (Exception e)
 		{

src/main/java/StevenDimDoors/mod_pocketDim/ticking/CustomLimboPopulator.java

@@ -30,7 +30,7 @@ public class CustomLimboPopulator implements IRegularTickReceiver {
 	{
 		this.properties = properties;
 		this.locations = new ConcurrentLinkedQueue<ChunkLocation>();
-		sender.registerForTicking(this, MONOLITH_SPAWNING_INTERVAL, false);
+		sender.registerReceiver(this, MONOLITH_SPAWNING_INTERVAL, false);
 	}
 	
 	@Override

src/main/java/StevenDimDoors/mod_pocketDim/ticking/FastRiftRegenerator.java

@@ -20,7 +20,7 @@ public class FastRiftRegenerator implements IRegularTickReceiver {
 	
 	public FastRiftRegenerator(IRegularTickSender sender)
 	{
-		sender.registerForTicking(this, RIFT_REGENERATION_INTERVAL, false);
+		sender.registerReceiver(this, RIFT_REGENERATION_INTERVAL, false);
 	}
 	
 	@Override
@@ -33,6 +33,7 @@ public class FastRiftRegenerator implements IRegularTickReceiver {
 	{
 		if (!locationsToRegen.isEmpty())
 		{
+			@SuppressWarnings("cast")
 			List<Integer> loadedWorlds = (List<Integer>) Arrays.asList(DimensionManager.getIDs());
 			for (Point4D point: locationsToRegen)
 			{

src/main/java/StevenDimDoors/mod_pocketDim/ticking/IRegularTickSender.java

@@ -3,6 +3,7 @@ package StevenDimDoors.mod_pocketDim.ticking;
 
 public interface IRegularTickSender {
 
-	public void registerForTicking(IRegularTickReceiver receiver, int interval, boolean onTickStart);
+	public void registerReceiver(IRegularTickReceiver receiver, int interval, boolean onTickStart);
+	public void unregisterReceivers();
 	
 }

src/main/java/StevenDimDoors/mod_pocketDim/ticking/LimboDecayScheduler.java

@@ -0,0 +1,28 @@
+package StevenDimDoors.mod_pocketDim.ticking;
+
+import StevenDimDoors.mod_pocketDim.world.LimboDecay;
+
+/**
+ * Handles scheduling of periodic fast Limbo decay operations.
+ */
+public class LimboDecayScheduler implements IRegularTickReceiver {
+	
+	private static final int LIMBO_DECAY_INTERVAL = 10; //Apply fast decay every 10 ticks
+	
+	private LimboDecay decay;
+	
+	public LimboDecayScheduler(IRegularTickSender tickSender, LimboDecay decay)
+	{
+		this.decay = decay;
+		tickSender.registerReceiver(this, LIMBO_DECAY_INTERVAL, false);
+	}
+
+	/**
+	 * Applies fast Limbo decay periodically.
+	 */
+	@Override
+	public void notifyTick()
+	{
+		decay.applyRandomFastDecay();
+	}
+}

src/main/java/StevenDimDoors/mod_pocketDim/ticking/RiftRegenerator.java

@@ -20,7 +20,7 @@ public class RiftRegenerator implements IRegularTickReceiver {
 	
 	public RiftRegenerator(IRegularTickSender sender)
 	{
-		sender.registerForTicking(this, RIFT_REGENERATION_INTERVAL, false);
+		sender.registerReceiver(this, RIFT_REGENERATION_INTERVAL, false);
 	}
 	
 	@Override

src/main/java/StevenDimDoors/mod_pocketDim/ticking/ServerTickHandler.java

@@ -14,19 +14,24 @@ public class ServerTickHandler implements ITickHandler, IRegularTickSender
 	private int tickCount = 0;
 	private ArrayList<RegularTickReceiverInfo> receivers;
 
-
 	public ServerTickHandler()
 	{
 		this.receivers = new ArrayList<RegularTickReceiverInfo>();
 	}
 
 	@Override
-	public void registerForTicking(IRegularTickReceiver receiver, int interval, boolean onTickStart)
+	public void registerReceiver(IRegularTickReceiver receiver, int interval, boolean onTickStart)
 	{
 		RegularTickReceiverInfo info = new RegularTickReceiverInfo(receiver, interval, onTickStart);
 		receivers.add(info);
 	}
 	
+	@Override
+	public void unregisterReceivers()
+	{
+		receivers.clear();
+	}
+
 	@Override
 	public void tickStart(EnumSet<TickType> type, Object... tickData) 
 	{

src/main/java/StevenDimDoors/mod_pocketDim/world/LimboDecay.java

@@ -1,4 +1,4 @@
-package StevenDimDoors.mod_pocketDim.ticking;
+package StevenDimDoors.mod_pocketDim.world;
 
 import java.util.Random;
 
@@ -13,13 +13,12 @@ import StevenDimDoors.mod_pocketDim.config.DDProperties;
  * Provides methods for applying Limbo decay. Limbo decay refers to the effect that most blocks placed in Limbo
  * naturally change into stone, then cobble, then gravel, and finally Unraveled Fabric as time passes.
  */
-public class LimboDecay implements IRegularTickReceiver {
+public class LimboDecay {
 
 	private static final int MAX_DECAY_SPREAD_CHANCE = 100;
 	private static final int DECAY_SPREAD_CHANCE = 50;
 	private static final int CHUNK_SIZE = 16;
 	private static final int SECTION_HEIGHT = 16;
-	private static final int LIMBO_DECAY_INTERVAL = 10; //Apply spread decay every 10 ticks
 	
 	//Provides a reversed list of the block IDs that blocks cycle through during decay.
 	private final int[] decaySequence;
@@ -28,7 +27,7 @@ public class LimboDecay implements IRegularTickReceiver {
 	private final DDProperties properties;
 	private final int[] blocksImmuneToDecay;
 	
-	public LimboDecay(IRegularTickSender tickSender, DDProperties properties)
+	public LimboDecay(DDProperties properties)
 	{
 		decaySequence = new int[] {
 			properties.LimboBlockID,
@@ -51,16 +50,6 @@ public class LimboDecay implements IRegularTickReceiver {
 		
 		this.properties = properties;
 		this.random = new Random();
-		tickSender.registerForTicking(this, LIMBO_DECAY_INTERVAL, false);
-	}
-
-	/**
-	 * Applies fast Limbo decay periodically.
-	 */
-	@Override
-	public void notifyTick()
-	{
-		applyRandomFastDecay();
 	}
 
 	/**
@@ -88,7 +77,7 @@ public class LimboDecay implements IRegularTickReceiver {
 	 * Picks random blocks from each active chunk in Limbo and, if decay is applicable, converts them directly to Unraveled Fabric.
 	 * This decay method is designed to stop players from avoiding Limbo decay by building floating structures.
 	 */
-	private void applyRandomFastDecay()
+	public void applyRandomFastDecay()
 	{
 		int x, y, z;
 		int sectionY;