No OpenAPI visible endpoint for endpoint declared in interface with default implementation

I'm writing a generic system de create REST endpoints.
I'm using Jersey + Spring in my project but my problem is only related to OpenAPI .
I use Swagger 2 (OpenAPI 3.0)

I'm declaring all my endpoints and their documentation in interfaces, with a default implementation. So in my class I don't have to declare the methods which already have a default implementation.

Here is a sample of my code :

public interface SampleEndpoints {


@POST
@Path("/")
@ApiResponses(value = {
@ApiResponse(responseCode = "201", description = "Created"),
@ApiResponse(responseCode = "400", description = "Bad Request"),
@ApiResponse(responseCode = "403", description = "Forbidden"),
@ApiResponse(responseCode = "404", description = "Not Found")})
default String create(Object param ) {
return "ok";
}

@GET
@Path("/{id}")
@ApiResponses(value = {
@ApiResponse(responseCode = "200", description = "Ok"),
@ApiResponse(responseCode = "400", description = "Bad Request"),
@ApiResponse(responseCode = "403", description = "Forbidden"),
@ApiResponse(responseCode = "404", description = "Not Found")})
String find(String id);

}

The controller class

@Component
@Path("/cars")
public class CarsController implements SampleEndpoints {

public String find(String id) {
return "Yes I've found it";
}

}

As you can see I don't have to implement the create method because its default implementation is sufficient.

My problem is that the create method doesn't appear in the generated openapi.json (but the find method is there, with all the informations)

If instead of an interface I declare SampleEndpoints as a class, and make my CarsController inherit of SampleEndpoints, then the open Api documentation works.

So I'd like to know if there is a way to make it works with interface ?

I can't manage to find a solution, but using interface instead of inheritance is mandatory because my controller needs to implements multiple interfaces.

Thanks for all your ideas :)