In JavaEE using asynchronous events logs "No valid EE environment for injection of ObserverClass"

I have implemented a REST endpoint in JavaEE that fires an asynchronous event to trigger a process each time the endpoint is used by a user.

This all works as intended and the process is triggered asynchronously, but results in a SEVERE level log: No valid EE environment for injection of TagsProcessor and I do not understand why.

Is this a bug in Payara? Or am I doing something wrong?

Here is an example implementation:

Rest endpoint where the event is fired on each login:

@Path("auth")
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
@RequestScoped
public class AuthenticationResource {

    @POST
    @Path("request-jwt")
    @PermitAll
    @Timed(name = "appV2RequestJwt", absolute = true)
    public Response appRequestJwt(RefreshRequest refreshRequest) {
        JwtResponse dto;

        try {
            dto = authenticationProcessor.appRequestJwt(refreshRequest);

            //Fire asynchronous event
            calculateTagsEvent.fireAsync(new CalculateTagsEvent(refreshRequest.getUsername()));

            return Response.ok(dto).build();
        } catch (Exception exception) {
            LOGGER.log(Level.SEVERE, "Could not request jwt: {}", exception.getMessage());
            dto = new JwtResponse(null, INTERNAL_SERVER_ERROR);
            return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(dto).build();
        }
    }

}

Observer class:

@RequestScoped
public class TagsProcessor {

    private static final Logger LOGGER = Logger.getLogger(TagsProcessor.class.getName());

    @Inject
    private BeanController beanController;


    //Observe asynchronous event
    public void manageCalculateTagsEvent(@ObservesAsync CalculateTagsEvent event) {
        LOGGER.log(Level.WARNING, "Event observed");
        beanController.create(new SomeBean());
    }
}

This results in the logs:

[#|2022-08-17T06:39:39.461+0000|SEVERE|Payara 5.201||_ThreadID=473;_ThreadName=payara-executor-service-task;_TimeMillis=1660718379461;_LevelValue=1000;| No valid EE environment for injection of TagsProcessor|#]

[#|2022-08-17T06:39:39.473+0000|WARNING|Payara 5.201|TagsProcessor|_ThreadID=473;_ThreadName=payara-executor-service-task;_TimeMillis=1660718379473;_LevelValue=900;| Event observed|#]

So it's working as intended, but is giving me the warning about the injection...

As mentioned in my comment I did try various scopes but in the end it's supposed to be a @Stateless EJB that can be spawned from a pool without being attached to the client's state.