AddProjectConfigurationRule does not affect if solution has no custom BuildType and Platform

[itn3000]

Overview

When ProjectConfigurationRule is added to SolutionModel by AddProjectConfigurationRule and output as slnx,
no affect on output slnx.

Environment

• architecture: x64
• dotnet sdk: 9.0.201
• dotnet runtime: 9.0.3
• Microsoft.VisualStudio.SolutionPersistence: 1.0.52 and github latest source( 19c3ca7 )

Steps to reproduce

1. create new console project and add Microsoft.VisualStudio.SolutionPersistence package
2. add following minimal code
3. check output slnx

here is the code:

static async Task MinimalReproducible()
{
    var solutionModel = new SolutionModel();
    var proj = solutionModel.AddProject("app1/app1.csproj");
    // comment out following three lines, then <Build Solution="Debug|*" Project="false"/> element will be added under app1/app1.csproj's element
    // solutionModel.AddBuildType("Release");
    // solutionModel.AddBuildType("Debug");
    // solutionModel.AddPlatform("Any CPU");
    proj.AddProjectConfigurationRule(new ConfigurationRule(BuildDimension.Build, "Debug", "Any CPU", "false"));
    await SolutionSerializers.SlnXml.SaveAsync("../test.slnx", solutionModel, default);
}

Expected result

<Build Project="false"/> is added under <Project Path="app1/app1.csproj">

<Solution>
  <Project Path="app1/app1.csproj">
    <Build Solution="Debug|*" Project="false" />
  </Project>
</Solution>

Actual result

there is no <Build> element under app1/app1.csproj's element.

<Solution>
  <Project Path="app1/app1.csproj" />
</Solution>

Additional

I tested on latest source on github(commit hash: 19c3ca7 ), I got same output.
uncomment AddBuildType and AddPlatform and run, output the following slnx(configurations of BuildType and PlatformType is disappeared?);

<Solution>
  <Project Path="app1/app1.csproj">
    <Build Solution="Debug|*" Project="false" />
  </Project>
</Solution>