tests/login/*.exp turn on the conservative mode
    
    In modified files [0] we can find a note that the
    Expect script is time-sensitive when combined with
    number of programs (e.g. ksh), and to discard or
    ignore keystrokes that come "too fast" after
    prompts after prompts.
    
    The solution is to use the conservative mode.
    
    [0]: https://src.fedoraproject.org/tests/shell/blob/main/f/tests/login/ssh.exp