[BUG] [CSHARP] [GENERICHOST] JsonConverter.mustache template broken for `anyOf` and `oneOf` with generic collections

[laazik]

openapi-generator/modules/openapi-generator/src/main/resources/csharp/libraries/generichost/JsonConverter.mustache

Line 398 in d11d0ef

{{datatypeWithEnum}}JsonConverter {{#lambda.camelcase}}{{datatypeWithEnum}}{{/lambda.camelcase}}JsonConverter = ({{datatypeWithEnum}}JsonConverter) jsonSerializerOptions.Converters.First(c => c.CanConvert({{#lambda.camelcase_sanitize_param}}{{model.classname}}{{/lambda.camelcase_sanitize_param}}.{{name}}{{^required}}Option.Value{{/required}}.GetType()));

For example the following yaml

 '202':
          description: Foo desc
          content:
            application/json:
              schema:
                anyOf:
                  - $ref: '#/components/schemas/Foo'
                  - type: array
                    items:
                      $ref: '#/components/schemas/Foo'

Generates following code, with incorrect < and > symbols emitted.

List<Foo>JsonConverter listltFoogtJsonConverter = (List<Foo>JsonConverter) jsonSerializerOptions.Converters.First(c => c.CanConvert(fooSendPost202Response.ListOption.Value.GetType()));
listltFoogtJsonConverter.WriteProperties(writer, fooSendPost202Response.ListOption.Value, jsonSerializerOptions);

GPt-5.4 and Claude proposed the following fix to the template - looks correct and generation works also correctly, but as I am no templating expert and mustache skills are also questionable, then would be great if someone takes a look into this.

 {{#composedSchemas}}
            {{#oneOf}}
            // oneOf block
            if ({{#lambda.camelcase_sanitize_param}}{{classname}}{{/lambda.camelcase_sanitize_param}}.{{name}} != null)
            {
                {{#isArray}}
                // isArray
                JsonSerializer.Serialize(writer, {{#lambda.camelcase_sanitize_param}}{{classname}}{{/lambda.camelcase_sanitize_param}}.{{name}}, jsonSerializerOptions);
                return;
                {{/isArray}}
                {{#isMap}}
                // isMap
                JsonSerializer.Serialize(writer, {{#lambda.camelcase_sanitize_param}}{{classname}}{{/lambda.camelcase_sanitize_param}}.{{name}}, jsonSerializerOptions);
                return;
                {{/isMap}}
            }

            {{/oneOf}}
            {{#anyOf}}
            // anyOf block
            {{#isArray}}
            // isArray
            if ({{#lambda.joinWithAmpersand}}{{^required}}{{#lambda.camelcase_sanitize_param}}{{model.classname}}{{/lambda.camelcase_sanitize_param}}.{{name}}Option.IsSet  {{/required}}{{#lambda.camelcase_sanitize_param}}{{model.classname}}{{/lambda.camelcase_sanitize_param}}.{{name}}{{^required}}Option.Value{{/required}} != null{{/lambda.joinWithAmpersand}})
            {
                JsonSerializer.Serialize(writer, {{#lambda.camelcase_sanitize_param}}{{model.classname}}{{/lambda.camelcase_sanitize_param}}.{{name}}{{^required}}Option.Value{{#vendorExtensions.x-is-value-type}}.Value{{/vendorExtensions.x-is-value-type}}{{/required}}, jsonSerializerOptions);
                return;
            }
            {{/isArray}}
            {{#isMap}}
            // isMap
            if ({{#lambda.joinWithAmpersand}}{{^required}}{{#lambda.camelcase_sanitize_param}}{{model.classname}}{{/lambda.camelcase_sanitize_param}}.{{name}}Option.IsSet  {{/required}}{{#lambda.camelcase_sanitize_param}}{{model.classname}}{{/lambda.camelcase_sanitize_param}}.{{name}}{{^required}}Option.Value{{/required}} != null{{/lambda.joinWithAmpersand}})
            {
                JsonSerializer.Serialize(writer, {{#lambda.camelcase_sanitize_param}}{{model.classname}}{{/lambda.camelcase_sanitize_param}}.{{name}}{{^required}}Option.Value{{#vendorExtensions.x-is-value-type}}.Value{{/vendorExtensions.x-is-value-type}}{{/required}}, jsonSerializerOptions);
                return;
            }
            {{/isMap}}
            {{/anyOf}}
            {{/composedSchemas}}
            {{/model.discriminator}}
            writer.WriteStartObject();