onBindViewHolder inside FirestoreRecyclerAdapter only works in Debug mode

Question

I have a list of students shown on a RecyclerView and retrieving data from Firebase I want to check a checkbox if they are inside a group. It apparently works, but only in Debug mode.

Whenever I try to do a normal run it does nothing (only shows the list, but none of the checkboxes are checked).

 @Override
protected void onBindViewHolder(@NonNull ListViewAdapter.ViewHolder holder, int position, @NonNull Estudiante estudiante) {
    DocumentSnapshot documentSnapshot = getSnapshots().getSnapshot(holder.getAbsoluteAdapterPosition());
    String id = documentSnapshot.getId();
    holder.nombre.setText(estudiante.getNombre());

    estudiantesFirebase = editGrupoFragment.getEstudiantesFirebase();
    Log.d("estList","Estudiantes Fireb: "+ estudiantesFirebase.toString());

    firestore.collection("Estudiantes")
            .get()
            .addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
                @Override
                public void onComplete(@NonNull Task<QuerySnapshot> task) {
                    if (task.isSuccessful()) {
                        ArrayList<String> list = new ArrayList<>();
                        for (QueryDocumentSnapshot document : task.getResult()) {
                            list.add(document.get("nombre").toString());
                        }

                        for (int i = 0; i < estudiantesFirebase.size(); i++){
                            if(estudiantesFirebase.get(i).equals(holder.nombre.getText().toString())){
                                Log.d("estList", estudiantesFirebase.get(i) + " => " + holder.nombre.getText().toString());
                                //TODO: quemar algo
                                holder.checkBox.setChecked(true);
                            }
                        }

                    } else {
                        Log.d("estList", "Error getting documents: ", task.getException());
                    }
                }
            });

}

Apparently, the ArrayList estudiantesFirebase has no values inside. The other class I am using (to get that array) is the following:

public class EditGrupoFragment extends DialogFragment{

private FragmentEditGrupoBinding binding;
private ListviewItemBinding bindingLV;


TextView txtNombreGrupo, txtNDificultadGrupo;
Spinner spinnerDificultadEditar;
Button btnGuardarCambios;
ListViewAdapter eAdapter;
RecyclerView recyclerView;
FirebaseFirestore firestore;
SearchView searchBar;
Query query;

ArrayList<String> estudiantesFirebase = new ArrayList<>();

String NGRUPO;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (getArguments()!=null){
        NGRUPO = getArguments().getString("nombre");
    }
}

@SuppressLint("NotifyDataSetChanged")
@Override
public View onCreateView(@NonNull LayoutInflater inflater,
                         ViewGroup container, Bundle savedInstanceState) {

    binding = FragmentEditGrupoBinding.inflate(inflater, container, false);
    View root = binding.getRoot();

    firestore = FirebaseFirestore.getInstance();

    searchBar = root.findViewById(R.id.searchBar);
    btnGuardarCambios = root.findViewById(R.id.btnGuardarEditGrupo);
    txtNombreGrupo = root.findViewById(R.id.etEditNombreGrupo);
    txtNDificultadGrupo = root.findViewById(R.id.txtNDificultadGrupo);
    spinnerDificultadEditar= root.findViewById(R.id.spinnerDificultadEditar);

    getGrupo();

    setUpRecyclerView(root);
    search_view();

    return root;
}

@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    btnGuardarCambios.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            String nombre = txtNombreGrupo.getText().toString();
            String dificultad = spinnerDificultadEditar.getSelectedItem().toString();
            //String description = txtDescriptionGrupo.getText().toString();

            updateGrupo(nombre, dificultad);
        }
    });
}


private void getGrupo(){
    firestore.collection("Temas").document(NGRUPO).get().addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {
        @Override
        public void onSuccess(DocumentSnapshot documentSnapshot) {
            String nombre = documentSnapshot.getString("nombre");
            String dificultad = documentSnapshot.getString("dificultad");
            estudiantesFirebase = (ArrayList<String>) documentSnapshot.get("estudiantes");

            txtNombreGrupo.setText(nombre);
            spinnerDificultadEditar.setPrompt("Actual: "+dificultad);
            //txtDescriptionGrupo.setText(grupo);

        }
    }).addOnFailureListener(new OnFailureListener() {
        @Override
        public void onFailure(@NonNull Exception e) {
            Toast.makeText(getContext(), "Error al obtener los datos", Toast.LENGTH_SHORT).show();
        }
    });

}

public ArrayList<String> getEstudiantesFirebase(){
    return estudiantesFirebase;
}

private void updateGrupo(String nombre, String dificultad) {
    Map<String, Object> map = new HashMap<>();
    map.put("nombre", nombre);
    map.put("dificultad", dificultad);

    firestore.collection("Temas").document(NGRUPO).update(map).addOnSuccessListener(new OnSuccessListener<Void>() {
        @Override
        public void onSuccess(Void unused) {
            Toast.makeText(getContext(), "Tema editado", Toast.LENGTH_SHORT).show();
            getDialog().dismiss();
        }
    }).addOnFailureListener(new OnFailureListener() {
        @Override
        public void onFailure(@NonNull Exception e) {
            Toast.makeText(getContext(), "Error al editar tema", Toast.LENGTH_SHORT).show();
        }
    });
}

@SuppressLint("NotifyDataSetChanged")
private void setUpRecyclerView(View view) {
    recyclerView = view.findViewById(R.id.searchRecyclerView);
    recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
    query = firestore.collection("Estudiantes");

    FirestoreRecyclerOptions<Estudiante> firestoreRecyclerOptions =
            new FirestoreRecyclerOptions.Builder<Estudiante>().setQuery(query, Estudiante.class).build();

    eAdapter = new ListViewAdapter(firestoreRecyclerOptions, getActivity(), getActivity().getSupportFragmentManager(),this);
    eAdapter.notifyDataSetChanged();
    recyclerView.setAdapter(eAdapter);
}

private void search_view() {
    searchBar.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String s) {
            textSearch(s);
            return false;
        }

        @Override
        public boolean onQueryTextChange(String s) {
            textSearch(s);
            return false;
        }
    });
}

private void textSearch(String s) {
    FirestoreRecyclerOptions<Estudiante> firestoreRecyclerOptions =
            new FirestoreRecyclerOptions.Builder<Estudiante>().setQuery(query.orderBy("nombre")
                    .startAt(s).endAt(s+"~"), Estudiante.class).build();

    eAdapter = new ListViewAdapter(firestoreRecyclerOptions, getActivity(), getActivity().getSupportFragmentManager(),this);
    eAdapter.startListening();
    recyclerView.setAdapter(eAdapter);
}

@Override
public void onStart() {
    super.onStart();
    eAdapter.startListening();
}
@Override
public void onStop() {
    super.onStop();
    eAdapter.stopListening();
}

@Override
public void onResume() {
    super.onResume();
    int width = getResources().getDisplayMetrics().widthPixels;
    int height = (getResources().getDisplayMetrics().heightPixels)/2;
    getDialog().getWindow().setLayout(width, height);
}

}