Prevent saving the iris level stems

core/src/main/java/com/volmit/iris/core/nms/INMSBinding.java

@@ -135,4 +135,6 @@ public interface INMSBinding {
     Pair<Integer, AutoClosing> injectUncached(boolean overworld, boolean nether, boolean end);
 
     boolean missingDimensionTypes(boolean overworld, boolean nether, boolean end);
+
+    void removeCustomDimensions(World world);
 }

core/src/main/java/com/volmit/iris/core/nms/v1X/NMSBinding1X.java

@@ -135,6 +135,11 @@ public class NMSBinding1X implements INMSBinding {
         return false;
     }
 
+    @Override
+    public void removeCustomDimensions(World world) {
+
+    }
+
     @Override
     public CompoundTag serializeEntity(Entity location) {
         return null;

core/src/main/java/com/volmit/iris/engine/platform/BukkitChunkGenerator.java

@@ -127,6 +127,7 @@ public class BukkitChunkGenerator extends ChunkGenerator implements PlatformChun
         try {
             if (initialized || !world.name().equals(event.getWorld().getName()))
                 return;
+            INMS.get().removeCustomDimensions(event.getWorld());
             world.setRawWorldSeed(event.getWorld().getSeed());
             Engine engine = getEngine(event.getWorld());
             if (engine == null) {

nms/v1_20_R1/src/main/java/com/volmit/iris/core/nms/v1_20_R1/NMSBinding.java

@@ -687,6 +687,11 @@ public class NMSBinding implements INMSBinding {
         return overworld || nether || end;
     }
 
+    @Override
+    public void removeCustomDimensions(World world) {
+        ((CraftWorld) world).getHandle().K.customDimensions = null;
+    }
+
     private WorldLoader.DataLoadContext supplier(WorldLoader.DataLoadContext old) {
         return dataLoadContext.aquire(() -> new WorldLoader.DataLoadContext(
                 old.resources(),

nms/v1_20_R2/src/main/java/com/volmit/iris/core/nms/v1_20_R2/NMSBinding.java

@@ -688,6 +688,11 @@ public class NMSBinding implements INMSBinding {
         return overworld || nether || end;
     }
 
+    @Override
+    public void removeCustomDimensions(World world) {
+        ((CraftWorld) world).getHandle().K.customDimensions = null;
+    }
+
     private WorldLoader.DataLoadContext supplier(WorldLoader.DataLoadContext old) {
         return dataLoadContext.aquire(() -> new WorldLoader.DataLoadContext(
                 old.resources(),

nms/v1_20_R3/src/main/java/com/volmit/iris/core/nms/v1_20_R3/NMSBinding.java

@@ -689,6 +689,11 @@ public class NMSBinding implements INMSBinding {
         return overworld || nether || end;
     }
 
+    @Override
+    public void removeCustomDimensions(World world) {
+        ((CraftWorld) world).getHandle().K.customDimensions = null;
+    }
+
     private WorldLoader.DataLoadContext supplier(WorldLoader.DataLoadContext old) {
         return dataLoadContext.aquire(() -> new WorldLoader.DataLoadContext(
                 old.resources(),

nms/v1_20_R4/src/main/java/com/volmit/iris/core/nms/v1_20_R4/NMSBinding.java

@@ -714,6 +714,11 @@ public class NMSBinding implements INMSBinding {
         return overworld || nether || end;
     }
 
+    @Override
+    public void removeCustomDimensions(World world) {
+        ((CraftWorld) world).getHandle().K.customDimensions = null;
+    }
+
     private WorldLoader.DataLoadContext supplier(WorldLoader.DataLoadContext old) {
         return dataLoadContext.aquire(() -> new WorldLoader.DataLoadContext(
                 old.resources(),

nms/v1_21_R1/src/main/java/com/volmit/iris/core/nms/v1_21_R1/NMSBinding.java

@@ -718,6 +718,11 @@ public class NMSBinding implements INMSBinding {
         return overworld || nether || end;
     }
 
+    @Override
+    public void removeCustomDimensions(World world) {
+        ((CraftWorld) world).getHandle().K.customDimensions = null;
+    }
+
     private WorldLoader.DataLoadContext supplier(WorldLoader.DataLoadContext old) {
         return dataLoadContext.aquire(() -> new WorldLoader.DataLoadContext(
                 old.resources(),

nms/v1_21_R2/src/main/java/com/volmit/iris/core/nms/v1_21_R2/NMSBinding.java

@@ -708,6 +708,11 @@ public class NMSBinding implements INMSBinding {
         return overworld || nether || end;
     }
 
+    @Override
+    public void removeCustomDimensions(World world) {
+        ((CraftWorld) world).getHandle().L.customDimensions = null;
+    }
+
     private WorldLoader.DataLoadContext supplier(WorldLoader.DataLoadContext old) {
         return dataLoadContext.aquire(() -> new WorldLoader.DataLoadContext(
                 old.resources(),

nms/v1_21_R3/src/main/java/com/volmit/iris/core/nms/v1_21_R3/NMSBinding.java

@@ -707,6 +707,11 @@ public class NMSBinding implements INMSBinding {
         return overworld || nether || end;
     }
 
+    @Override
+    public void removeCustomDimensions(World world) {
+        ((CraftWorld) world).getHandle().L.customDimensions = null;
+    }
+
     private WorldLoader.DataLoadContext supplier(WorldLoader.DataLoadContext old) {
         return dataLoadContext.aquire(() -> new WorldLoader.DataLoadContext(
                 old.resources(),