[BUG] Using webflux with router functions results in duplicated swagger-ui api doc

[influence160]

Describe the bug
i have created a demo project starting from https://github.com/springdoc/springdoc-openapi-demos/tree/master/springdoc-openapi-spring-boot-2-webflux-functional this demo project and i have used the generated openapi.yaml and wanted to recreate the same project using openApiGenerator maven plugin https://github.com/OpenAPITools/openapi-generator/

i have commited my project in this location https://github.com/influence160/openapi-generator-springdoc-boot-webflux-fonctionnal-example

The bug is that in the resulted swagger-ui, the api doc is duplicated like this

To Reproduce

• Provide with a sample code (HelloController) or Test that reproduces the problem
  https://github.com/influence160/openapi-generator-springdoc-boot-webflux-fonctionnal-example
• What version of spring-boot you are using?
• What modules and versions of springdoc-openapi are you using?
  versions are in the pom.xml
• What is the actual and the expected result using OpenAPI Description (yml or json)?
  expected when i open http://localhost:8080/webjars/swagger-ui/index.html i should have the api doc shown one time
  actual : the api doc is shown twice

Steps to reproduce the behavior:
to reproduce clone the project : build the project and run the WebfluxFunctionalDemoApplication class and go to http://localhost:8080/webjars/swagger-ui/index.html

note that in this project i just use the module users from the original demo project and i havent used the modules employees and coffee.
note2 : and because i wanted to have a webflux with routing functions project and openpi-generator is generating interfaces that returns Mono<ResponseEntity<T>> i had to convert all the Mono to Mono using the method https://github.com/influence160/openapi-generator-springdoc-boot-webflux-fonctionnal-example/blob/master/src/main/java/othmen/test/openapigenerator/springdoc/demo/app4/user/Util.java

[influence160]

In the generated interface, When i remove the attribute tags = {"Users"} in the annotations @Operation of all methods Or i remove the annotation @Tag(name = "api", description = "the api API") in the generated interface, the bug is fixed

So i understand that springdocs use the @Tag annotation to generate a separated doc and use the tags attributes of the @Operation annotations to generate another doc

I dont know if the bug
is in springdocs because it shouldnt generate only one doc when he find @Tag annotation and tags`` attributes in the ``@Operation`` annotations or is in openapigenerator because it should not generated the ``@Tag`` annotation and tagsattributes in the@Operation`` annotations in the same interface

[bnasslahsen]

Not a bug.