[BUG][CSHARP] Issue with '&' (ampersand) in string data

hi,
my customer found a problem with '&' handling in json.
after some debug, i believe the problem is in openapi generator for c#.

my server is java and in the last 2 years i never had any issue with openapi/server java.

im using the last jar, and here is how i generate my client in ant:

<java jar="**openapi-generator-cli-7.9.0.jar**"
  fork="true"
    failonerror="true"
    maxmemory="128m">
  <arg value="generate"/>
  <arg value="--skip-validate-spec"/>
  <arg value="-g"/>
  <arg value="csharp"/>	  
  <arg value="--additional-properties=targetFramework=net48"/>
  <arg value="--additional-properties=packageName=${csprj}"/>
  <arg value="--additional-properties=validatable=false"/>	  	  
  <arg value="-o"/>
  <arg value="generated"/>
  <arg value="-i"/>
  <arg value="${yaml.dir}/wsd.json"/>
</java>

here is an example of a data field ("notes")

        "S1UserInfo": {
            "type": "object",
            "properties": {
                ....
                "**notes**": {
                    "type": "string",
                    "nullable": true
                },

everything work well, except when i set the S1UserInfo.notes to "a & b". my java server (i checked using zalando's http logger) it show "a & b", as in html.
i hope somebody can help me to understand if is a bug or i missed something.

thanks,
David

Start by reproducing the report with the Ant generate command using openapi-generator-cli-7.9.0.jar, the C# generator, and the S1UserInfo.notes string value a & b. Compare the generated client's request with the server's logged payload; done means the literal ampersand is transmitted without becoming &.