[BUG][JAVA] field names convention not respected in response model

Description

Hello Everyone. I'm using maven plugin openapi-generator-maven-plugin in version 6.6.0 to generate pojo models based on provided Swagger 2.0 which describes some REST api with response body which contains fields with field names given in UpperCamelCase convention

even though model seems to be generated correctly, at least under serialized name:

while setting actual values in response model, I can see in debug and also while testing in Postman that it's actually using standard camel case convention. It seems it's using variable name, not serialized name.

openapi-generator version

6.6.0

OpenAPI declaration file content or url

		<plugin>
			<groupId>org.openapitools</groupId>
			<artifactId>openapi-generator-maven-plugin</artifactId>
			<version>6.6.0</version>
			<executions>
				<execution>
					<id>transactions</id>
					<goals>
						<goal>generate</goal>
					</goals>
					<configuration>
						<inputSpec>${project.basedir}/src/main/resources/Transactions.json</inputSpec>
						<generatorName>java</generatorName>
						<strictSpec>true</strictSpec>
						<configOptions>
							<sourceFolder>src/gen/java/main</sourceFolder>
							<identifierNamingConvention>original</identifierNamingConvention>
						</configOptions>
						<generateApis>false</generateApis>
						<apiPackage>transactions</apiPackage>
						<modelPackage>transactions</modelPackage>
					</configuration>
				</execution>
			</executions>
		</plugin>

Reproduce the report with the openapi-generator-maven-plugin 6.6.0, the Java generator, and the referenced Transactions.json Swagger 2.0 input. Inspect the generated response model and its serialization behavior; done means UpperCamelCase schema field names remain consistent when values are assigned and serialized.