diff --git a/core/src/main/java/net/momirealms/craftengine/core/block/behavior/BlockBehaviors.java b/core/src/main/java/net/momirealms/craftengine/core/block/behavior/BlockBehaviors.java
index 556f4a93f..acb6fc6ce 100644
--- a/core/src/main/java/net/momirealms/craftengine/core/block/behavior/BlockBehaviors.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/block/behavior/BlockBehaviors.java
@@ -17,7 +17,6 @@ import java.util.Map;
 
 public class BlockBehaviors {
     public static final Key EMPTY = Key.from("craftengine:empty");
-    public static final Key UNSAFE_COMBINED = Key.from("craftengine:unsafe_combined");
 
     public static void register(Key key, BlockBehaviorFactory factory) {
         Holder.Reference<BlockBehaviorFactory> holder = ((WritableRegistry<BlockBehaviorFactory>) BuiltInRegistries.BLOCK_BEHAVIOR_FACTORY)
diff --git a/core/src/main/java/net/momirealms/craftengine/core/plugin/gui/category/ItemBrowserManagerImpl.java b/core/src/main/java/net/momirealms/craftengine/core/plugin/gui/category/ItemBrowserManagerImpl.java
index e0c326271..46a4709bc 100644
--- a/core/src/main/java/net/momirealms/craftengine/core/plugin/gui/category/ItemBrowserManagerImpl.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/plugin/gui/category/ItemBrowserManagerImpl.java
@@ -52,6 +52,7 @@ public class ItemBrowserManagerImpl implements ItemBrowserManager {
     public void unload() {
         this.byId.clear();
         this.categoryOnMainPage.clear();
+        this.externalMembers.clear();
     }
 
     @Override