spring-modulith-observability breaks RestControllers implementing an Interface

When the spring-modulith-observability dependency is present, RestControllers that implement any interface are no longer serving their endpoints or apear in the OpenAPI documentation (Swagger).

This is not limited to interfaces with Rest Annotations (like @GetMapping), or OpenAPI Annotations, but also to interfaces that are not related to the REST API, including empty marker interfaces.

The expected behavior is, that the spring-modulith-observability doesn't have an effect on the availability of RestControllers implementing an interface.

Reproducer https://github.com/gmuecke/spring-modulith-observability-reproducer

Spring Modulith: 1.2.0, 1.1.5
Spring Boot: 3.3.0, 3.2.6
JDK 21

Inizia con il reproducer spring-modulith-observability collegato ed eseguilo con le versioni elencate di Spring Modulith e Spring Boot. Confronta i RestControllers che implementano interfacce con e senza la dipendenza, verificando la disponibilità degli endpoint e la documentazione OpenAPI; il lavoro è completo quando i controller che implementano interfacce funzionano in entrambi i casi.