SpringDocUI doest add Javadoc into swagger from abstract class

[SashaVolushkova]

Describe the bug

I turn on javadoc for Swagger. I describe my base class (question) with javadoc. But this description is not added into Swagger (only childs javadoc is viewed)

To Reproduce
Steps to reproduce the behavior:

• What version of spring-boot you are using: group: 'org.springdoc', name: 'springdoc-openapi-starter-webmvc-ui', version: '2.6.0'
• What modules and versions of springdoc-openapi are you using: only springdoc-openapi-starter-webmvc-ui
• What is the actual and the expected result using OpenAPI Description (yml or json): no metter
• Provide with a sample code (HelloController) or Test that reproduces the problem:

@RestController
public class Controller {

    @PostMapping
    public String post(@RequestBody Test test){
        return test.toString();
    }
}

@NoArgsConstructor
@AllArgsConstructor
@ToString
@Getter
@Setter
public class Test {
    private List<Question> questions;
}

/**
 * base class for all questions in test with polymorphism
 */
@AllArgsConstructor
@NoArgsConstructor
@ToString
@Getter
@Setter
@JsonTypeInfo(
        use = JsonTypeInfo.Id.NAME,
        include = JsonTypeInfo.As.PROPERTY,
        property = "type")
@JsonSubTypes({
        @JsonSubTypes.Type(value = TestQuestion.class, name = "test"),
        @JsonSubTypes.Type(value = TextQuestion.class, name = "text")
})
public abstract class Question {
    private String question;
    private String type;
}
/**
 * test question
 */
@AllArgsConstructor
@NoArgsConstructor
@ToString
@Getter
@Setter
//@Schema(description = "Test", allOf = {Question.class}, type = "object")
public class TestQuestion extends Question {
    /**
     * list of variants
     */
    private List<String> variants;
    /**
     * correct answer
     */
    private int answer;
}
@AllArgsConstructor
@NoArgsConstructor
@ToString
@Getter
@Setter
//@Schema(description = "Text", allOf = {Question.class}, type = "object")
public class TextQuestion extends Question {
    private String answer;
}

Expected behavior

• Java doc coments should be in swagger and in yaml and json

Screenshots

Additional context
if controller has an abstract class as a parameter or return type there is no this problem. Only if an abstract class used as a type of the property in another class