[4.8 -> 4.9] Generic Linux device connection test hangs at SFTP checking step

After upgrading from 4.8 to 4.9 I can't deploy application from Windows anymore. 4.10.0 doesn't work as well.

If I try to check connection with remote Linux device using "Test" button in "tools->Options->Devices", QtCreator hangs at "Checking whether an SFTP connection can be set up...". (see attached screenshot).

If I run QtCreator 4.9.0 on GNU/Linux (Debian Buster), then connection check works correctly and application can be deployed to the target..

As I known QtCreator started to use OpenSSH tools since 4.9.0. So I've tried to upgrade them on Windows from 7.6 (default) to 7.9p1 (latest). No difference. 

I've tried sftp.exe manually to upload file to the target and it worked as expected.