@using Syncfusion.Blazor.Navigations

@page "/"

<SfMenu Items=@_items>
    <MenuEvents TValue="MenuItemModel" ItemSelected=@OnItemSelected></MenuEvents>
</SfMenu>

@code {
    private List<MenuItemModel>? _items = null;

    protected override void OnInitialized()
    {
        _items = new List<MenuItemModel>() { new MenuItemModel() { Id = "Item1", Text = "Caption #1" } };
    }

    private async Task OnItemSelected()
    {
        await Task.Yield(); // An "await" triggers the error.  Without it, the error does not occur.
        _items = new List<MenuItemModel>() { new MenuItemModel() { Id = "Item2", Text = "Caption #2" } };
    }
}