Improve DataObserver reference holding

I'm trying to use obervable queries to detect when the user is logged in my application in order to start fetching data in background with correct authorization token.

    ...
    userBox.query().build().subscribe().observe(users -> fetchUserData());
    ...
    boxStore.subscribe(User.class).observe(class -> fetchUserData());

First "live" query doesn't work whilst the second works fine whenever I put(user) a new user in the userBox.

Is this correct? I'm not sure from which thread the user is being inserted, might this be an issue?
Does it make sense to use a "live" query to observe the insertion of new objects or is it just for changes in existing objects?
Live queries would be great, for my application and are the main feature that made me pick ObjectBox, hope I can get it working.

Comienza rastreando DataObserver y las rutas de suscripción de live-query descritas en el informe, y después compáralas con boxStore.subscribe(User.class). Comprueba cómo se mantienen las referencias de las consultas y qué hilo gestiona las inserciones. Se considera terminado cuando la live query observa de forma fiable los usuarios recién insertados y el comportamiento está aclarado o cubierto por una prueba adecuada.