Unable to generate utf-8 request in .net core on consuming a wcf with basic transport http binding with certificate authentication

Question

I am consuming a wsdl described as :

<wsdl:binding name="PassengerConformance_v1Binding"
    type="tns:PassengerConformanceAuthenticationPortType">
    <soap:binding style="document"
        transport="http://schemas.xmlsoap.org/soap/http" />
    <wsdl:operation name="identify">
    </wsdl:operation>
</wsdl:binding>

But the request getting generated is UTF16, which the server wants to be utf-8 This is how my code looks

 var binding = new BasicHttpBinding(BasicHttpSecurityMode.Transport)
 {
     Security = new BasicHttpSecurity
     {
         Mode = BasicHttpSecurityMode.Transport,
         Transport = new HttpTransportSecurity
         {
             ClientCredentialType = HttpClientCredentialType.Digest
         }
     }
 };     
 var address = new EndpointAddress(dcsServiceConfiguration.Url);     
 var channel = new ChannelFactory<T>(binding, address);     
 channel.Credentials.HttpDigest.ClientCredential =
      new NetworkCredential(username, Password);     
 var buildDir = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
 var filePath = buildDir + @"\ClientCert.pfx";     
 channel.Credentials.ClientCertificate.Certificate =
     new X509Certificate2(filePath, "password", X509KeyStorageFlags.MachineKeySet);  

 binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Certificate;     
 return channel;

I understand that BasicHttpBinding deafult textEncoding value is utf-8, but still when I check in the message inspector, it comes to be utf-16.

I noticed that when I replicated this code in .net 7.2 framework consoel app, there was no xml tag. which would still work for me Please help.