classgraph: Classpath Scanning in Spring Boot Jar Not Working

I have a custom annotation:

@Target(value=ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface Pipeline  {
  String id ();
  String name ();
  boolean visible () default true;
  String role () default "USER";
}

Which I use on interfaces within a Spring Boot App with nested jars:

@Pipeline(id="my-pipeline", name="My Pipeline")
public interface Echo {
  ...
}

My project structure:

parent-boot-project
   |
   --- plugin1.jar 
   --- plugin2.jar <--- interfaces are here
   --- ...

Next, I use lukehutch’s fast-classpath-scanner to scan for them:

new FastClasspathScanner(BASE_PACKAGE)
    .matchClassesWithAnnotation(PIPELINE_ANNOTATION, aProcessor)
    .verbose()
    .scan();

Works great on my IDE (eclipse) but not when I build the jar. Tried messing around with the classpath but to no avail. Anyone ran into something like that?