quarkus: smallrye-jwt returns stale claim data from previous JWT

It seems that the quarkus smallrye-jwt integration holds on to values from previous JWT invocations and returns stale claim values instead of the ones from the current JWT.

E.g. accessing currentUsername always returns the value from the first JWT that was used to call the /data/user endpoint.

import org.eclipse.microprofile.jwt.Claim;
import org.eclipse.microprofile.jwt.Claims;

import javax.annotation.security.RolesAllowed;
import javax.inject.Inject;
import javax.json.Json;
import javax.json.JsonString;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import java.util.Optional;

@Path("/data")
public class DataResource {

    private static final JsonString ANOYNMOUS = Json.createValue("anonymous");
   
    @Inject
    @Claim(standard = Claims.preferred_username)
    Optional<JsonString> currentUsername;

    @GET
    @Path("/user")
    @Produces(MediaType.TEXT_PLAIN)
    @RolesAllowed({"user"})
    public String userData() {
        return "data for user " + currentUsername.orElse(ANOYNMOUS);
    }
}

See discussion on twitter: https://twitter.com/thomasdarimont/status/1110569492520808450 The following example helps to reproduce the issue: https://github.com/thomasdarimont/quarkus-keycloak-demo