diff --git a/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/BukkitCompatibilityManager.java b/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/BukkitCompatibilityManager.java
index 4e00a179d..af6afe670 100644
--- a/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/BukkitCompatibilityManager.java
+++ b/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/BukkitCompatibilityManager.java
@@ -82,8 +82,12 @@ public class BukkitCompatibilityManager implements CompatibilityManager {
         }
         // WorldEdit
         if (this.isPluginEnabled("FastAsyncWorldEdit")) {
-            this.initFastAsyncWorldEditHook();
-            logHook("FastAsyncWorldEdit");
+            try {
+                this.initFastAsyncWorldEditHook();
+                logHook("FastAsyncWorldEdit");
+            } catch (Exception e) {
+                this.plugin.logger().warn("[Compatibility] Failed to initialize FastAsyncWorldEdit hook", e);
+            }
         } else if (this.isPluginEnabled("WorldEdit")) {
             this.initWorldEditHook();
             logHook("WorldEdit");
@@ -172,10 +176,28 @@ public class BukkitCompatibilityManager implements CompatibilityManager {
         }
     }
 
+    @SuppressWarnings("all")
     private void initFastAsyncWorldEditHook() {
+        Plugin fastAsyncWorldEdit = Bukkit.getPluginManager().getPlugin("FastAsyncWorldEdit");
+        String version = VersionHelper.isPaper() ? fastAsyncWorldEdit.getPluginMeta().getVersion() : fastAsyncWorldEdit.getDescription().getVersion();
+        if (!this.fastAsyncWorldEditVersionCheck(new int[]{2, 13, 0}, version)) {
+            this.plugin.logger().warn("[Compatibility] FastAsyncWorldEdit version is too old, please update to 2.13.0 or newer");
+        }
         new WorldEditBlockRegister(BukkitBlockManager.instance(), true);
     }
 
+    private boolean fastAsyncWorldEditVersionCheck(int[] target, String version) {
+        String cleanVersion = version.split("-")[0];
+        String[] parts = cleanVersion.split("\\.");
+        for (int i = 0; i < target.length; i++) {
+            if (i >= parts.length) return false;
+            int currentPart = Integer.parseInt(parts[i]);
+            if (currentPart > target[i]) return true;
+            if (currentPart < target[i]) return false;
+        }
+        return true;
+    }
+
     private void initWorldEditHook() {
         WorldEditBlockRegister weBlockRegister = new WorldEditBlockRegister(BukkitBlockManager.instance(), false);
         try {
diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/PacketConsumers.java b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/PacketConsumers.java
index 31acebdf2..9b2deba0c 100644
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/PacketConsumers.java
+++ b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/PacketConsumers.java
@@ -2083,9 +2083,9 @@ public class PacketConsumers {
         try {
             FriendlyByteBuf buf = event.getBuffer();
             ItemBuildContext context = ItemBuildContext.of((BukkitServerPlayer) user);
+            int slot = buf.readVarInt();
             Object friendlyBuf = FastNMS.INSTANCE.constructor$FriendlyByteBuf(buf);
             ItemStack itemStack = FastNMS.INSTANCE.method$FriendlyByteBuf$readItem(friendlyBuf);
-            int slot = buf.readVarInt();
             BukkitItemManager.instance().s2c(itemStack, context).ifPresent((newItemStack) -> {
                 event.setChanged(true);
                 buf.clear();
@@ -2290,7 +2290,7 @@ public class PacketConsumers {
     private static BukkitNetworkManager.Handlers simpleAddEntityHandler(EntityPacketHandler handler) {
         return (user, event) -> {
             FriendlyByteBuf buf = event.getBuffer();
-            user.entityPacketHandlers().put(buf.readVarInt(), handler);
+            user.entityPacketHandlers().putIfAbsent(buf.readVarInt(), handler);
         };
     }
 }
diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/util/Reflections.java b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/util/Reflections.java
index ede8f4f74..ea7173512 100644
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/util/Reflections.java
+++ b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/util/Reflections.java
@@ -3604,7 +3604,7 @@ public class Reflections {
 
     public static final Field field$FallingBlockEntity$blockState = requireNonNull(
             ReflectionUtils.getDeclaredField(
-                    clazz$FallingBlockEntity, clazz$BlockState, 0
+                    clazz$FallingBlockEntity, clazz$BlockState, VersionHelper.isOrAbove1_21_5() ? 1 : 0
             )
     );
 
diff --git a/core/src/main/java/net/momirealms/craftengine/core/pack/host/impl/DropboxHost.java b/core/src/main/java/net/momirealms/craftengine/core/pack/host/impl/DropboxHost.java
index 091115e16..3c605ed84 100644
--- a/core/src/main/java/net/momirealms/craftengine/core/pack/host/impl/DropboxHost.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/pack/host/impl/DropboxHost.java
@@ -225,7 +225,7 @@ public class DropboxHost implements ResourcePackHost {
 
             try (HttpClient client = HttpClient.newBuilder().proxy(this.proxy).build()) {
                 HttpRequest request = HttpRequest.newBuilder()
-                        .uri(URI.create("https://alist.nn.ci/tool/dropbox/callback"))
+                        .uri(URI.create("https://api.dropboxapi.com/oauth2/token"))
                         .header("Content-Type", "application/x-www-form-urlencoded")
                         .header("Authorization", authHeader)
                         .POST(HttpRequest.BodyPublishers.ofString(
diff --git a/core/src/main/java/net/momirealms/craftengine/core/pack/host/impl/OneDriveHost.java b/core/src/main/java/net/momirealms/craftengine/core/pack/host/impl/OneDriveHost.java
index de06dd2b3..9c413d5e0 100644
--- a/core/src/main/java/net/momirealms/craftengine/core/pack/host/impl/OneDriveHost.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/pack/host/impl/OneDriveHost.java
@@ -189,7 +189,6 @@ public class OneDriveHost implements ResourcePackHost {
             try (HttpClient client = HttpClient.newBuilder().proxy(this.proxy).build()) {
                 String formData = "client_id=" + URLEncoder.encode(this.clientId, StandardCharsets.UTF_8) +
                         "&client_secret=" + URLEncoder.encode(this.clientSecret, StandardCharsets.UTF_8) +
-                        "&redirect_uri=" + URLEncoder.encode("https://alist.nn.ci/tool/onedrive/callback", StandardCharsets.UTF_8) +
                         "&refresh_token=" + URLEncoder.encode(this.refreshToken.left(), StandardCharsets.UTF_8) +
                         "&grant_type=refresh_token" +
                         "&scope=Files.ReadWrite.All+offline_access";
diff --git a/server-mod/v1_21_5/src/main/resources/mixins.craftengine.json b/server-mod/v1_21_5/src/main/resources/mixins.craftengine.json
index 288b6501f..69e19f9d0 100644
--- a/server-mod/v1_21_5/src/main/resources/mixins.craftengine.json
+++ b/server-mod/v1_21_5/src/main/resources/mixins.craftengine.json
@@ -6,7 +6,6 @@
   "target": "@env(DEFAULT)",
   "compatibilityLevel": "JAVA_21",
   "server": [
-    "BlocksMixin",
-    "ItemStackMixin"
+    "BlocksMixin"
   ]
 }