Semi-Sync Replica can KILL a reässigned connection

When a semi-sync replica shuts down, it opens a second connection to KILL the original on the primary's side without verification.
But the primary can have already KILLed its side of the connection due to this replica timing out (including due to misconfiguration) or as requested by a DBA.

The self-KILL's error handling likely covers the consequence of KILLing an already-KILLed and now non-existent connection.
But if the server also reässigns the replica's old CONNECTION_ID to someöne else, then this "graceful" self-KILL would unknowingly KILL that connection, nonëxistent or even reässigned connection.

This problem would not occur if the replica also detected disconnection and force-stopped due to connection failure (after any @@master_retry_count).