Windows에서 Go의 두 번째 입력에서 Scanf가 실패하는 이유는 무엇입니까?

<code class="go">func credentials() (string, string) {

    var username string
    var password string

    fmt.Print("Enter Username: ")
    fmt.Scanf("%s", &username)

    fmt.Print("Enter Password: ")
    fmt.Scanf("%s", &password)

    return username, password
}</code>

<code class="go">func credentials() (string, string) {
    reader := bufio.NewReader(os.Stdin)

    fmt.Print("Enter Username: ")
    username, _ := reader.ReadString('\n')

    fmt.Print("Enter Password: ")
    password, _ := reader.ReadString('\n')

    return strings.TrimSpace(username), strings.TrimSpace(password) // Remove trailing newline character
}</code>