I’m trying to truncate a file on a SFTP server by opening a stream and then setting the length. The docs state that the stream will be truncated to the provided length. But the file remains unchanged.

If the specified value is less than the current length of the stream,
the stream is truncated and – if the current position is greater than
the new length – the current position is moved to the last byte of the
stream.

var _client = new SftpClient("host", "user", "pass");
try
{
    _client.Connect();
    using (var stream = _client.OpenWrite("\file2.txt"))
    {
        stream.SetLength(9);
        //stream.Flush(); //no change with or without
    }
}
catch (Exception ex)
{
    Log(ex.Message);
}

The stream is working when I append more data to the file or if I make changes, but it won’t get smaller. Thus I can’t remove text from the file.

How can I remove all bytes from a file past a certain length?

Sftp server is FileZilla Pro Enterprise