Using not_intent slot mapping option to exclude nlu fallback not working

Hi there. I have a couple of forms where I want to use the option not_intent in order to don’t map a value onto a slot when the intent nlu_fallback is identified. All the slots of this forms are defined in the same way:

  - entity: name
    intent: inform_name
    not_intent: nlu_fallback
    type: from_entity

And I declare de nlu_fallback intent in the domain.yml. However, when a message with intent nlu_fallback is recognized by the NLU model, the slots are still filled.