public class DataService
{
    public static DataService Instance { get; } = new DataService();

    private readonly Realm LocalRealm;

    public IRealmCollection<Device> DeviceList { get; }

    public async Task<Device> AddDevice(Device device)
    {
        return await LocalRealm.WriteAsync(() =>
        {
            return LocalRealm.Add(device, true);
        });
    }
}

public partial class DeviceListViewModel : ObservableObject
{
    public ObservableCollection<Models.Device> DeviceList { get; } = [];

    private IDisposable deviceListNotifyToken;

    public DeviceListViewModel()
    {
        deviceListNotifyToken = DataService.Instance.DeviceList.SubscribeForNotifications((list, changeSet) =>
        {
            if (changeSet != null)
            {
                foreach (var idx in changeSet.InsertedIndices)
                    DeviceList.Insert(idx, list[idx]);

                foreach (var idx in changeSet.ModifiedIndices)
                {
                    var item = list[idx];
                    DeviceList.RemoveAt(idx);
                    DeviceList.Insert(idx, item);
                }

                foreach (var idx in changeSet.DeletedIndices)
                    DeviceList.RemoveAt(idx);
            }

            OnPropertyChanged();
        });
    }
}

No crash.

No log.