Insert/Update of interfaced type

Hello!
I'm found some error in Insert/Update operation if I pass interfaced type.

public int SaveAbstract(IObjectBase item)
{
    item._Updated = DateTime.UtcNow;
    if (item.ID > 0) c.Update(item, transaction: tr, commandTimeout: commandTimeout);
    else item.ID = (int)c.Insert(item, transaction: tr, commandTimeout: commandTimeout);
    cache.Remove(item.GetType().FullName.makeCacheKey());
    return item.ID;
}

Currently, Update and Insert method can't find table attribute on IObjectBase and substitute object class name. I'm start investigate and found some lines in this methods:
var type = typeof(T);

I think this line need to be replaced to entityToUpdate.GetType() because Insert/Update need to be know real type of passed item. After changes Insert/Update working correctly.

Start with the Insert and Update methods referenced in the issue and inspect how typeof(T) is used to resolve the table attribute. Reproduce the SaveAbstract(IObjectBase item) path with an implementing object, then verify that both operations resolve the concrete type and complete successfully.