DataGrid's LoadData method is not called since 4.15.13

I have this piece of code in my .razor file:

<RadzenDataGrid TItem="TestListEntry"
                AllowVirtualization="true"
                AllowFiltering="true"
                Data="_data"
                Count="_count"
                IsLoading="_isLoading"
                FilterPopupRenderMode="PopupRenderMode.OnDemand"
                LogicalFilterOperator="LogicalFilterOperator.And"
                FilterMode="FilterMode.SimpleWithMenu"
                Value="_selected"
                ValueChanged="OnSelectionChangedAsync"
                LoadData="LoadDataAsync"
                @bind-Settings="_settings"
                SelectionMode="DataGridSelectionMode.Multiple"
                AllowRowSelectOnRowClick="true"
                AllowColumnResize="true"
                AllowMultiColumnSorting="true"
                AllowSorting="true"
                Style="@Style"
                @ref="_grid">

And the respective fields are like this:

    private IEnumerable<TestListEntry>? _data;
    private IList<TestListEntry>? _selected;
    private bool _isLoading;
    private int _count;
    private RadzenDataGrid<TestListEntry>? _grid;
    private DataGridSettings? _settings;

Since version 4.15.13, LoadDataAsync is never called. It is if I use versions up to 4.15.12.

Did anything change about the data types to use?

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