외부 함수에서 Sync.WaitGroup 복사본을 사용하면 고루틴에서 출력이 누락되는 이유는 무엇입니까?

<code class="go">func main() {
    ch := make(chan int)

    var wg sync.WaitGroup
    wg.Add(2)

    go Print(ch, &wg)

    go func() {
        for i := 1; i <= 11; i++ {
            ch <- i
        }
        close(ch)
        defer wg.Done()
    }()

    wg.Wait()
}

func Print(ch <-chan int, wg *sync.WaitGroup) {
    for n := range ch { // reads from channel until it's closed
        fmt.Println(n)
    }
    defer wg.Done()
}</code>

<code class="go">func Print(ch <-chan int) {
    for n := range ch { // reads from channel until it's closed
        fmt.Println(n)
    }
}</code>

<code class="go">wg.Wait()
close(ch)</code>