Retrieval Intents throws errors in rasa data validate

I’m also having troubles with rasa data validate when having retrieval intents. In my case, I have two retrieval intent rules (faq & chichat), and I’m getting the following warnings before the Project validation completed with errors message appears:

/~/lib/python3.8/site-packages/rasa/shared/utils/io.py:93: UserWarning: The action 'utter_faq' is used in the stories, but is not a valid utterance action. Please make sure the action is listed in your domain and there is a template defined with its name.
  More info at https://rasa.com/docs/rasa/actions#utterance-actions
/~/lib/python3.8/site-packages/rasa/shared/utils/io.py:93: UserWarning: The action 'utter_chitchat' is used in the stories, but is not a valid utterance action. Please make sure the action is listed in your domain and there is a template defined with its name.
  More info at https://rasa.com/docs/rasa/actions#utterance-actions

This issue disappears if you put the retrieval intent responses within your NLU files instead of in your domain.yml file. However, when doing that, RasaX doesn’t recognize them during model training