ScpClient.Download hangs under some circumstances regardless OperationTimout set

ScpClient.Download hangs under some circumstances

       ScpClient scp = null;
       try
       {
       scp = new ScpClient(ip.ToString(), int.Parse(data.PortSSH), data.Login, data.Password);
       scp.OperationTimeout = new TimeSpan(0, 0, 10);
       scp.Connect();
       scp.Download(download, save);

There is probably some issue on server side, as scp on linux server ends like this:

[login@host ~]$ scp login@xxx.xxx.xxx.xxx:/file.exp ~/
login@xxx.xxx.xxx.xxx's password:
exec request failed on channel 0

This discussion can give you some more info, it seems to be related.
https://forum.mikrotik.com/viewtopic.php?t=104485
Server will be most probably updated, so I may not be able to try it again.

Start at the ScpClient.Connect and ScpClient.Download entry points and inspect how OperationTimeout is applied when the server returns "exec request failed on channel 0". The issue names no repository files or tests, so first reproduce the hang with a server exhibiting this response; done means the client no longer hangs and the timeout behavior is covered by an appropriate test.