"slot_was_set" in stories after activating a form

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Hi, I’m using Rasa and I developed for educational purposes a chatbot whose code is here: github link

I’m trying to understand the use of slot_was_set in stories after activating a form which requires a slot with custom mapping.

In my chatbot I have, for example, these slots:

stars:
    type: list
    influence_conversation: true
    mappings:
      - type: custom
        conditions:
          - active_loop: form_review
            requested_slot: stars

  set_restaurant_list:
    type: bool
    influence_conversation: true
    mappings:
      - type: custom

and I manage the activation and submission of the forms in this way:

- story: Input the average review (stars) for restaurants
    steps:
      - intent: stars
      - slot_was_set:
          - restaurant_type: "something"
      - action: action_reset_review
      - slot_was_set:
          - stars: null
      - slot_was_set:
          - set_restaurant_list: null
      - action: form_review
      - active_loop: form_review
      - slot_was_set:
          - stars: [4, 5]
      - slot_was_set:
          - requested_slot: null
      - active_loop: null
      - action: action_set_restaurant_list
      - action: action_give_last_restaurant_list

Using this “logic”, everything works perfectly. If instead I write the stories this other way

- story: Input the average review (stars) for restaurants
    steps:
      - intent: stars
      - slot_was_set:
          - restaurant_type: "something"
      - action: action_reset_review
      - slot_was_set:
          - stars: null
      - slot_was_set:
          - set_restaurant_list: null
      - action: form_review
      - active_loop: form_review
      - slot_was_set:
          - requested_slot: null
      - active_loop: null
      - action: action_set_restaurant_list
      - action: action_give_last_restaurant_list

removing the slot_was_set after submitting the form, the chatbot doesn’t work fine: in the middle of the conversation, it doesn’t reply to the user. (fallback prediction)

My question is, then, should I always put slot_was_set in the stories if I submit a form that is not managed by the RulePolicy?