Mismatched behavior for verify the KnownType with Desktop version

[huanwu]

When serialize a object with unknown type, if the serializer contains a DataContractResolver, it will end up with SerializationException. However, no exception thrown from Desktop Version. This is because, in core version, it always verify knowtype if there's resolver. In the code:
System.Private.DataContractSerialization\src\System\Runtime\Serialization\XmlObjectSerializerWriteContext.cs

Core Version, which always return true when there's resolver :

protected virtual bool WriteTypeInfo(XmlWriterDelegator writer, DataContract contract, DataContract declaredContract)
{
    if (XmlObjectSerializer.IsContractDeclared(contract, declaredContract))
    {
        return false;
    }
    bool hasResolver = DataContractResolver != null;
    if (hasResolver)
    {
        WriteResolvedTypeInfo(writer, contract.UnderlyingType, declaredContract.UnderlyingType);
    }
    else
    {
        WriteTypeInfo(writer, contract.Name, contract.Namespace);
    }
    return hasResolver;
}

Desktop Version, which always return false.

protected virtual bool WriteTypeInfo(XmlWriterDelegator writer, DataContract contract, DataContract declaredContract)
    {
        if (!XmlObjectSerializer.IsContractDeclared(contract, declaredContract))
        {
            if (DataContractResolver == null)
            {
                WriteTypeInfo(writer, contract.Name, contract.Namespace);
                return true;
            }
            else
            {
                WriteResolvedTypeInfo(writer, contract.OriginalUnderlyingType, declaredContract.OriginalUnderlyingType);
                return false;
            }
        }
        return false;
    }