diff --git a/common-files/src/main/resources/resources/default/configuration/blocks/palm_tree.yml b/common-files/src/main/resources/resources/default/configuration/blocks/palm_tree.yml
index 6002d41ac..1e2e8afd7 100644
--- a/common-files/src/main/resources/resources/default/configuration/blocks/palm_tree.yml
+++ b/common-files/src/main/resources/resources/default/configuration/blocks/palm_tree.yml
@@ -154,6 +154,9 @@ items:
       fuel-time: 100
     data:
       item-name: <!i><i18n:item.palm_sapling>
+      lore:
+        - "<!i><gray>Requires the datapack tree configuration to function."
+        - "<!i><gray>If not configured, an oak tree will grow by default."
     model:
       template: default:model/generated
       arguments:
@@ -171,7 +174,7 @@ items:
               - minecraft:farmland
               - minecraft:sand
           - type: sapling_block
-            feature: minecraft:fancy_oak
+            feature: minecraft:fancy_oak # use custom tree configuration here
             bone-meal-success-chance: 0.45
         loot:
           template: default:loot_table/self
diff --git a/core/src/main/java/net/momirealms/craftengine/core/pack/allocator/VisualBlockStateAllocator.java b/core/src/main/java/net/momirealms/craftengine/core/pack/allocator/VisualBlockStateAllocator.java
index 7087b55d2..9c729bc97 100644
--- a/core/src/main/java/net/momirealms/craftengine/core/pack/allocator/VisualBlockStateAllocator.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/pack/allocator/VisualBlockStateAllocator.java
@@ -91,6 +91,7 @@ public class VisualBlockStateAllocator {
                         // 如果候选满足组，那么直接允许起飞
                         if (pair.left().test(candidate.blockState())) {
                             pair.right().complete(candidate.blockState());
+                            candidate.setUsed();
                         } else {
                             // 不满足候选组要求，那就等着分配新的吧
                         }
@@ -109,13 +110,15 @@ public class VisualBlockStateAllocator {
         for (AutoStateGroup group : AutoStateGroup.values()) {
             List<Pair<String, CompletableFuture<BlockStateWrapper>>> pendingAllocationFuture = this.pendingAllocationFutures[group.ordinal()];
             for (Pair<String, CompletableFuture<BlockStateWrapper>> pair : pendingAllocationFuture) {
-                BlockStateCandidate nextCandidate = group.findNextCandidate();
-                if (nextCandidate != null) {
-                    nextCandidate.setUsed();
-                    this.cachedBlockStates.put(pair.left(), nextCandidate.blockState());
-                    pair.right().complete(nextCandidate.blockState());
-                } else {
-                    pair.right().completeExceptionally(new StateExhaustedException(group));
+                if (!pair.right().isDone()) {
+                    BlockStateCandidate nextCandidate = group.findNextCandidate();
+                    if (nextCandidate != null) {
+                        nextCandidate.setUsed();
+                        this.cachedBlockStates.put(pair.left(), nextCandidate.blockState());
+                        pair.right().complete(nextCandidate.blockState());
+                    } else {
+                        pair.right().completeExceptionally(new StateExhaustedException(group));
+                    }
                 }
             }
         }