Fix dupe bug

src/main/java/com/gmail/nossr50/util/TransientEntityTracker.java

@@ -124,6 +124,16 @@ public class TransientEntityTracker {
         addToChunkLookupCache(trackedTamingEntity);
     }
 
+    /**
+     * Checks if a living entity is a summon
+     *
+     * @param livingEntity target livinig entity
+     * @return true if target living entity is a summon
+     */
+    public synchronized boolean isTransientSummon(@NotNull LivingEntity livingEntity) {
+        return getChunkLookupCache().contains(livingEntity);
+    }
+
     /**
      * Get the tracked taming entities for a player
      * If the player isn't registered this will return null