diff --git a/tosfs/core.py b/tosfs/core.py
index d6adf18..324a8d9 100644
--- a/tosfs/core.py
+++ b/tosfs/core.py
@@ -846,6 +846,19 @@ def isdir(self, path: str) -> bool:
         except TosServerError as e:
             if e.status_code == TOS_SERVER_STATUS_CODE_NOT_FOUND:
                 return False
+            if (self._get_bucket_type(bucket) == TOS_BUCKET_TYPE_HNS
+                and e.status_code == CONFLICT_CODE
+                and e.header._store["x-tos-ec"][1] == "0026-00000020"):
+                out = retryable_func_executor(
+                    lambda: self.tos_client.list_objects_type2(
+                        bucket,
+                        prefix=key,
+                        delimiter="/",
+                        max_keys=1,
+                    ),
+                    max_retry_num=self.max_retry_num,
+                )
+                return out.key_count > 0
             raise e
 
     def isfile(self, path: str) -> bool: