Client certificate authentication works with .NET 8 and fails with .NET 9

Describe the bug

I'm using the following server settings:

    _mockSignPathApi = WireMockServer.Start(
        new WireMockServerSettings
        {
          Port = 8888,
          ClientCertificateMode = ClientCertificateMode.AllowCertificate,
          AcceptAnyClientCertificate = true,
          UseSSL = true
        });

and use your own client_cert.pfx from your test suite as client certificate. In .NET 8 this set up works, in .NET 9 this fails (i.e, the request fails, I don't even come to the point where I could assert whether it's there).

Expected behavior:

It should work with .NET 9 too.

Other related info

Newest WireMock.NET version.