Incorrect suggestion to "Convert to 'using' declaration Follow

(Using Resharper version 2020.1.4)

Consider the following console application:

using System;
using System.Runtime.Serialization;
using System.Text;
using System.Xml;

namespace ConsoleApp1
{
    class Program
    {
        static void Main()
        {
            Console.WriteLine(Serialise("test"));
        }

        public static string Serialise(string data)
        {
            var serialiser = new DataContractSerializer(typeof(string));
            var result = new StringBuilder();

            using (var writer = XmlWriter.Create(result))
            {
                serialiser.WriteObject(writer, data);
            }

            return result.ToString();
        }
    }
}

The output of this is:

<?xml version="1.0" encoding="utf-16"?><string xmlns="http://schemas.microsoft.com/2003/10/Serialization/">test</string>

Resharper suggests converting the `using` to a using declaration, like so:

public static string Serialise(string data)
{
    var serialiser = new DataContractSerializer(typeof(string));
    var result = new StringBuilder();

    using var writer = XmlWriter.Create(result);
    serialiser.WriteObject(writer, data);

    return result.ToString();
}

If you follow this advice then the code is broken - the return value from `Serialize()` will now be an empty string.

Is this a bug? Or just something to watch out for? (If the latter, then it makes the "Convert to 'using' declaration in file|project|solution" options too dangerous to use effectively.)