diff --git a/test_array_state_issue.nyash b/test_array_state_issue.nyash
new file mode 100644
index 00000000..f6d48bae
--- /dev/null
+++ b/test_array_state_issue.nyash
@@ -0,0 +1,11 @@
+// 🚨 ArrayBox状態保持問題のテスト
+static box Main {
+    init { result }
+    main() {
+        local arr
+        arr = new ArrayBox()
+        arr.push("hello")     // 状態変更
+        me.result = arr.length()  // 期待値: 1, 実際: 0?
+        return me.result
+    }
+}
\ No newline at end of file