CodePaste.NET - .Where Clause parameter Expression<Func<T>> or Func<T>

// works as expected
public wws_Item LoadBySku(string sku)
{
    Expression< Func<wws_Item, bool> > func = itm => itm.Sku == sku;
 
    Entity = Context.wws_Items.Where(func).SingleOrDefault();
    if (Entity != null)
        OnLoaded(Entity);
 
    return this.Entity;
    // return LoadBase(func);  // works
}
 
// doesn't work (Entity is null) but compiles
public wws_Item LoadBySku(string sku)
{
    Func<wws_Item, bool> func = itm => itm.Sku == sku;
 
    Entity = Context.wws_Items.Where(func).SingleOrDefault();
    if (Entity != null)
        OnLoaded(Entity);
 
    return this.Entity;
    // return LoadBase(func);  // doesn't work
}