Trying to make a simple specific conditional loop it gives a action_default_fallback

Hi, I have this story file:

version: "3.1"

stories:

- story: pedir rut historia 0
  steps:
  - intent: greet
  - action: utter_greet
  - action: rut_form
  - slot_was_set:
    - requested_slot: null
  - active_loop: null
  - action: action_get_rut_data
  - checkpoint: after_rut


- story: historia 1.1
  steps:
  - checkpoint: after_rut
  - slot_was_set:
    - goto_1_1: true
  - action: utter_first_menu_1_1
  - action: form_1_1
  - slot_was_set:
    - requested_slot: null
  - active_loop: null
  - checkpoint: after_1_1


- story: historia 1.1.1
  steps:
  - checkpoint: after_1_1
  - slot_was_set:
    - goto_1_1_1: true
  - action: action_check_polizas
  - slot_was_set:
    - preguntar_polizas: true
  - action: form_polizas
  - slot_was_set:
    - requested_slot: null
  - active_loop: null
  - checkpoint: tipo_de_reembolso_1_1_1


- story: historia 1.1.1-2
  steps:
  - checkpoint: after_1_1
  - slot_was_set:
    - goto_1_1_1: true
  - action: action_check_polizas
  - checkpoint: tipo_de_reembolso_1_1_1


- story: historia 1.1.1-3
  steps:
  - checkpoint: tipo_de_reembolso_1_1_1
  - action: utter_tipo_de_reembolso
  - action: form_tipo_reembolso
  - action: form_sub_tipo_reembolso
  - slot_was_set:
    - ask_isapre: true
  - action: form_bono

- story: historia 1.1.1-4
  steps:
  - checkpoint: tipo_de_reembolso_1_1_1
  - action: utter_tipo_de_reembolso
  - action: form_tipo_reembolso
  - action: form_sub_tipo_reembolso  <---------- here
  - slot_was_set:
    - cargar_archivo: true
  - action: utter_flag
  - checkpoint: cargar_archivo <---- here 2


- story: cargar archivos
  steps:
  - checkpoint: cargar_archivo
  - action: form_cargar_archivos
  - action: form_subir_mas_archivos
  - slot_was_set:
    - mas_archivos: true
  - action: action_reset_mas_archivos
  - slot_was_set:
    - mas_archivos: null
  - checkpoint: cargar_archivo <----here 3

when Rasa goes by the marked place “here”, it throws the fallback (it doesn’t utter the flag). If I delete the line “here 3”, everything goes ok. If I put in “here 2” a checkpoint to “tipo_de_reembolso_1_1_1” (same story) it works ok. If I try to loop to any other checkpoint that is not “cargar_archivo” it does well. Rasa doesn’t want to make specifically THAT loop. I don’t understand what is happening. Any clues?

Thanks in advice

I would start by reading the Rasa Forms docs and following the example there for entering and exiting the form. Also, make sure all slots are set with influence_conversation: False.