通过反射获取方法受接收者是否为指针的影响

I used Go's reflection function to get the type of the method, but I found that the method I can get is related to whether the recipient is a pointer. Why is that?

When I ran the code below, I got the following result。

--- value interface ---
Test
--- pointer interface ---
Test
ToString

I don't understand how the result obtained by the Method method is related to whether the recipient is a pointer or not.

type User struct{}
type Admin struct{ User }

func (*User) ToString() {
    fmt.Println("tostring")
}

func (Admin) Test() {
    fmt.Println("test")
}
func main27() { 
    var u Admin
    methods := func(t reflect.Type) {
        for i, n := 0, t.NumMethod(); i < n; i++ {
            m := t.Method(i)
            fmt.Println(m.Name)
        }
    }
    fmt.Println("--- value interface ---")
    methods(reflect.TypeOf(u)) 
    fmt.Println("--- pointer interface ---")
    methods(reflect.TypeOf(&u))
}