Created Unassigned: ShouldSerialize{Property} not working if the method is virtual [25421]

public class A
{
}

public class B
{
public A A { get; set;}
public virtual bool ShouldSerializeA()
{
return false;
}
}

Using version 6.0.2 this fails since the ShouldSerializeA is never called. If I make the method non virtual then it works.