Data duplication after Apache IoTDB pipe restart, how to maintain the existing sync progress?

When using Apache IoTDB's pipe feature to sync data to another Apache IoTDB instance, I encountered duplicate data transmission. The scenario is as follows: I configured a Pipe from root.source to a remote IoTDB instance (root.target): CREATE PIPESINK remote_sink AS IoTDB ('ip:6667', 'username', 'password'); CREATE PIPE source_to_target TO remote_sink FROM (SOURCE 'root.source.we4rwe.**') INTO (TARGET 'root.target.faknlv93.**');` START PIPE source_to_target; The initial sync works fine, but when I manually restart the Pipe service (e.g., STOP PIPE source_to_target followed by START PIPE), some historical data (e.g., already synced root.source.d1.sensor data) is retransmitted, causing duplicates on the target. The pipe status (SHOW PIPES) shows status=RUNNING with no error logs. Is this the expected behavior of IoTDB Pipe? How to avoid duplicate data transmission during Pipe restart? Are additional configurations (e.g., sync_progress or other parameters) required?