When SftpClient is disconnected during SftpClient .DownloadFile

Hi! together!

I've tried to download some files by SftpClient. Sometimes the program got freeze for some reason.
It's what I've tried to debug to see what was happening.

client.DownloadFile(sFilePath, fileStream, offset =>
{
    try
    {
        if (offset > 4389170) // I assume that the connection is disconnected while the file is being downloaded.
            client.Disconnect();
    }
    catch (Exception ex)
    {
    }
});

I've tried to make SftpClient disconnected while the file is being downloaded.
It seems I success reproduce the problem that I'm dealing with. (Actually I'm not 100% sure..)
It's doing nothing when It's disconnected. It is maybe because nothing come in on the callback function.

When if it turns out it's a bug, how about add some code inside of SftpClient.InternalDownloadFile while clause

if (IsConnected == false)
   throw new SshConnectionException("Connection has been disconnected.");

PS. It's my first time to post Issues on github. If there are some mistakes, please let me know.

UPDATE

I've checked it's stuck in a deadlock in SftpFileReader.Read() function when the connection get disconnected while file is being downloaded. Please someone help me and I want to discuss how to solve this problem with all of you.

Beginne damit, die Verbindungsunterbrechung während SftpClient.DownloadFile zu reproduzieren, und untersuche anschließend SftpClient.InternalDownloadFile sowie den in der Issue identifizierten Deadlock in SftpFileReader.Read(). Verfolge, was passiert, wenn die Verbindung geschlossen wird, während der Download-Callback aktiv ist. Erledigt ist die Aufgabe, wenn der Download nicht mehr hängen bleibt und der getrennte Zustand mit beobachtbarem Fehlerverhalten behandelt wird.