Rules for forms do not work as expected

Rasa Open Source
1

Hello everybody,

I am currently trying to debug an issue where a form rule is not producing the desired output.

rules.yml

# Stay form
- rule: Activate stay_form
  steps:
  - intent: ask_availability
  - action: stay_form
  - active_loop: stay_form

- rule: Submit stay_form
  condition: 
  - active_loop: stay_form
  steps:
  - action: stay_form
  - active_loop: null
  - slot_was_set: 
    - requested_slot: null
  - action: action_calculate_num_nights 
  - action: room_type_form


### Room type form
- rule: Activate room_type_form
  steps:
  - intent: inform_room_type
  - action: room_type_form
  - active_loop: room_type_form

- rule: Submit room_type_form
  condition: 
  - active_loop: room_type_form
  steps:
  - action: room_type_form
  - active_loop: null
  - slot_was_set: 
    - requested_slot: null
  - action: utter_num_room_types

domain.yml

  room_type_form:
    required_slots:
    - num_single_rooms
  
  stay_form:
    required_slots:
    - checkin_date
    - checkout_date

Log from rasa interactive --debug

    slot{"checkout_date": "2022-07-31"}
      slot{"requested_slot": null}
      active_loop{"name": null}
      action_calculate_num_nights 1.00
      slot{"num_nights": 2}
      room_type_form 1.00
      active_loop{"name": "room_type_form"}
      slot{"requested_slot": "num_single_rooms"}
      How many single rooms do you need?
      slot{"num_single_rooms": 1}
      slot{"requested_slot": null}
      active_loop{"name": null}


Current slots:
        first_name: None, last_name: None, email: None, mobile_number: None, name: None, checkin_date_dummy: 2022-07-29T00:00:00.000+02:00, checkin_date: 2022-07-29, checkout_date: 2022-07-31, num_nights: 
2, num_single_rooms: 1, num_double_rooms: None, room_proposal: None, contact_channel: None, requested_slot: None, session_started_metadata: None

------
2022-07-26 19:24:56 DEBUG    rasa.core.tracker_store  - Recreating tracker for id '8aeb02c9b6034bb88e1bbc3ee30b266b'
? The bot wants to run 'action_listen', correct? (Y/n)

The stay_form and the associated rules work perfectly and the actions “action_calculate_num_nights” and “room_type_form” are triggered as desired. Unfortunately the rules in “submit room_type_form” are not obeyed. After filling the slot I get an “action_listen” and not the required action “utter_num_room_types”.

Any idea how to solve this? Both forms and rules look similar to me and I do not have the ideas why the rules on the “room_type_form” are not behaving as expected.

Thanks for your help!