ASP.NET BeginForm does not apply the route mapping when making the request

I have a route problem (again), I use ASP.NET MVC5, and I have the following route mapped:

routes.MapRoute(
    "Search_route",
    "Home/Search/{search_input}/{search_input_category}",
    new { 
        controller = "Home",
        action = "Search",
        search_input = UrlParameter.Optional,
        search_input_category = UrlParameter.Optional
    }

);

If I apply: Url.Action("Search", "Home", new { search_input = "casa", search_input_category = "vetores" }) my return will be: / Home / Search / home / vectors . But when trying to use this route in the following form:

@using (Html.BeginForm("Search", "Home", FormMethod.Get, new { @class = "search-form" })){
         //Todos os campos de input devidamente nomeados
}