Rebex SSH keyboard interactive issue

Hi
we are using .net rebex.terminal, Ssh, Common version 5.0.7077.0. and during keyboard interactive login in AuthenticationRequest handler we use await to get user answer from keyboard. issue is when we use await, next question is comming in seconds after previous, without waiting of answer. without await keyword it is working as expected.
what is the best practice to handle keyboard interactive auth method in WPF applications?

thank you in advance!