@JsonSubTypes are not generated for jaxrs-resteasy

Description

I am trying to generate code using jaxrs-resteasy for my swagger file as follows,

<artifactId>swagger-codegen-maven-plugin</artifactId>
<executions>
    <execution>
        <configuration>
            <language>jaxrs-resteasy</language>
        </configuration>
    </execution>
</executions>

Generated code does NOT generate following expected @JsonSubTypes annotations.

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "businessPartnerType", visible = true )
@JsonSubTypes({
  @JsonSubTypes.Type(value = BusinessPartnerCompany.class, name = "BusinessPartnerCompany"),
  @JsonSubTypes.Type(value = BusinessPartnerPerson.class, name = "BusinessPartnerPerson"),
})
public class BusinessPartner {

But, I noticed there are generated correctly when I use,

<artifactId>swagger-codegen-maven-plugin</artifactId>
<executions>
    <execution>
        <configuration>
            <language>java</language>
            <additionalProperties>
                <additionalProperty>library=resteasy</additionalProperty>
            </additionalProperties>
        </configuration>            
    </execution>
<executions>

Swagger-codegen version

I am using following dependency in my pom.xml file

<groupId>io.swagger.codegen.v3</groupId>
<artifactId>swagger-codegen-maven-plugin</artifactId>
<version>3.0.36</version>

I guess I am missing some configurations for jaxrs-resteasy, can someone help me on this?

Start by reproducing the two Maven plugin configurations in pom.xml: jaxrs-resteasy and java with the resteasy library. Compare the generated model output and trace where the @JsonTypeInfo and @JsonSubTypes annotations are selected; done means jaxrs-resteasy generates the expected annotations as the java/resteasy configuration does.