The SSH server implementation of AsyncSSH before 1.12.1 does not properly check whether authentication is completed before processing other requests. A customized SSH client can simply skip the authentication step.
https://groups.google.com/forum/#%21msg/asyncssh-announce/57_5O7kiHSA/8BXZ_hxHAQAJ
https://github.com/ronf/asyncssh/commit/c161e26cdc0d41b745b63d9f17b437f073bf7ba4