List parameter on child component not updating – Asp.net

I have a child component for filtering a search (DropdownFilter) which takes an input of a list of suggestions and a function to update that list.

For some reason DropdownFilter.Suggestions isn’t being updated after it is initially set and I don’t know how to update it again. Any information about how to update the property after it is initially bound would be great!

DropdownFilter.razor:

<input id="search" @onfocus="SearchFocused" @onblur="SearchUnfocused" @oninput="UpdateSearchText" />
@foreach (var suggestion in Suggestions)
{
    <p>@suggestion</p>
}

@code {
    [Parameter]
    public Action<string> SearchFieldChanged { get; set; }

    //[Parameter]
    //public RenderFragment<TSuggestion> SuggestionTemplate { get; set; }
    [Parameter]
    public List<string> Suggestions { get; set; }

    private bool searchFocus = false;
    private void SearchFocused(FocusEventArgs args) {
        searchFocus = true;
        //UpdateSearchText();
    }
    private void SearchUnfocused(FocusEventArgs args) => searchFocus = false;

    private void UpdateSearchText(ChangeEventArgs args)
    {
        SearchFieldChanged.Invoke((string)args.Value);
    }

    public void Refresh() {
        StateHasChanged();
    }
}

Index.razor:

@page "/example"

<div class="container-fluid dropdown-holder">
    <DropdownFilter @ref="dropdown" Suggestions="@maskResults" SearchFieldChanged="UpdateSearchResults" />
</div>

@code {
    DropdownFilter dropdown;

    public class MaskResult {
        public string name;
    }

    static readonly string[] allMasks = {
            "Electric",
            "Water",
            "Ground",
            "Fire",
            "Bug"
        };

    public List<string> maskResults = allMasks.ToList();

    private void UpdateSearchResults(string search)
    {
        search = search.ToLower();

        maskResults = allMasks.Where((mask) =>
        {
            return mask.ToLower().StartsWith(search);
        }).ToList();

        dropdown.Refresh();
    }
}