c# calling async function from constructor gives green underline in VS

Question

say I am doing something async and calling this function from the class constructor:

public partial class Page_MainMenuDetail : TabbedPage
{
    ObservableCollection<AdsType> mainList = new ObservableCollection<AdsType>();
    public Page_MainMenuDetail()
    {
        InitializeComponent();
        LoadMainContent(false);
    }

    private async Task LoadMainContent(bool loadMore)
    {
        if (!loadMore)
        {
            mainList = await ReloadAdapter.LoadAllAds(0, 4);
            listview_mainView.ItemsSource = mainList;
        }
    }
}

My reloadAdapter is just a class that makes an API call and returns an observable collection. But since I await for the reload adapter result, the LoadMainFunction() function has to be async. But that means, that when I call it from inside the constructor it looks like this in the framework (VS):

The green line indicates that the function is not beeing awaited. Which is true, but I cannot await inside a constructor (as you cannot make a constructor async).

Is this my wrongdoing or is this a common thing? Ofc I can put the LoadMainContent() into another function that itself is async nbut not a task, and then call that from the constructor, but that is just a workaround to get rid of the green underline.

Or maybe I am doing this concept wrong?