runtime: Unable to add a Certificate in ClientCertificates from HttpClientHandler/SocketsHttpHandler

Description

Hello, When I try to add a credential in ClientCredentials, its throws a NullReferenceException although, the code i wrote is quite simple

try
      {
          Stream stream = await FileSystem.OpenAppPackageFileAsync("d.cer");

          using MemoryStream s = new();
          stream.CopyTo(s);
          stream.Dispose();
          
          X509Certificate2 cert = new X509Certificate2(s.ToArray(), "PASSWORD");
          
          SocketsHttpHandler shh = new()
          {
              UseCookies = true,
              AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip,
              SslOptions =
              {
                  EnabledSslProtocols = System.Security.Authentication.SslProtocols.Tls12,
                  LocalCertificateSelectionCallback = (a,b,c,d,e) => c[0],
                  RemoteCertificateValidationCallback = (a,b,c,d) => true,
                  
              }
          };

          shh.SslOptions.ClientCertificates.Add(cert);
          
          HttpClient c = new(shh);

          var x = await c.GetAsync(new Uri("URL"));
          _ = 1;
      }
      catch (Exception e)
      {
          _ = e;
      }

Its throw on the shh.SslOptions.ClientCertificates.Add(cert);

The certificate itself has a sha256 algoritm with its public key as RSA 2048 Bits

I also tried to use the network_security_config.xml from android and it crashed when i put the CA and pin

Steps to Reproduce

1. Run the example that i wrote on the description
2. Put it somewhere in the code, like a button
3. Click it 🐞

Link to public reproduction project repository

https://github.com/taz4270/ExampleCert.App

Version with bug

7.0 (current)

Last version that worked well

Unknown/Other

Affected platforms

iOS, Android

Affected platform versions

Android 13, iOS 16

Did you find any workaround?

No response

Relevant log output

No response