The `RSocketMessagingAutoConfiguration` should "connect" components annotated with `@ControllerAdvice` to `MessagingAdviceBean`. See [this comment in Spring Framework](https://github.com/spring-projects/spring-framework/issues/26636#issuecomment-791480328) and [this commit](https://github.com/spring-projects/spring-framework/commit/6214ff153fd92e9fd37c5d7dee83f2cc9c9e89ce) linked to from that same issue.