Missing " in C# code generator

Bug Description

The code generator for C# removes " in the substitution string.

Reproduction steps

Lets say I have a file, containing text like this:

version: 3
version: 4
version: "5"

and I want to change the version representation to a uniform representation like

version: "3"
version: "4"
version: "5"

So I write this regex:

^version:\s*(?<version>\d+(?:\.\d+)*)$

and the following substitution:

version: "${version}"

When I test this in the Regex101 environment I get the expected results. But when I export it to C# code using the code generator, I get this code:

using System;
using System.Text.RegularExpressions;

public class Example
{
    public static void Main()
    {
        string pattern = @"^version:\s*(?<version>\d+(?:\.\d+)*)$";
        string substitution = @"version: ${version}";
        string input = @"version: 3
version: 4
version: 5";
        RegexOptions options = RegexOptions.Multiline;

        Regex regex = new Regex(pattern, options);
        string result = regex.Replace(input, substitution);
    }
}

As you can see in the line where the variable substitution is declared, the string does not contain ", which causes the regex substitution to be incorrect.

Expected Outcome

The substitution variable should either be string substitution = @"version: ""${version}"""; or string substitution = "version: \"${version}\"";.

Complete code

using System;
using System.Text.RegularExpressions;

public class Example
{
    public static void Main()
    {
        string pattern = @"^version:\s*(?<version>\d+(?:\.\d+)*)$";
        string substitution = @"version: ""${version}""";
        string input = @"version: 3
version: 4
version: 5";
        RegexOptions options = RegexOptions.Multiline;

        Regex regex = new Regex(pattern, options);
        string result = regex.Replace(input, substitution);
    }
}

Browser

Browser	Version
Firefox:	114.0.2
Chrome	114.0.5735.199
Edge	114.0.1823.67

OS

Windows 11 22H2

firasdib / Regex101