DialogFlow Intent - async_action:False - Not Working?

Hi, been using Dialogflow intent scripts for a while now and they work well and are quite speedy. I have a particular intent, where I would like to delay the speech response for a few seconds while a sensor value gets returned…

I tried the async_action: False parameter which as I read it is supposed to wait until the script is complete before returning a response. This feature doesn’t seem to work in my setup.

It takes a few seconds for the item to be queued to my player and I was hoping to respond back with the queued item. Running 0.84.1 and my intent look something like this:

lms_dialog_play_intent:
    speech:
      text: 'Playing {{state_attr("media_player.kitchen", "media_title")}} on the player'
    async_action: False
    action:
    - service: input_text.set_value
      data_template:
        entity_id: input_text.lms_command_intent
        value: "{{lms_command}}"
# Set player
    - service: input_text.set_value
      data_template:
        entity_id: input_text.lms_p3
        value: "{{lms_player}}"
    - service: input_select.select_option
      data_template:
        entity_id: input_select.lms_player
        option: >
            {% if (states.input_text.lms_p3.state == '') %} {{states.input_select.lms_player.state}}
            {% else %} {{states.input_text.lms_p3.state}} {% endif %}
# Set shuffle
    - service: input_text.set_value
      data_template:
        entity_id: input_text.lms_p3
        value: "{{lms_shuffle}}"
    - service_template: >
             {% if ((states.input_text.lms_p3.state == '') and (states.input_boolean.lms_shuffle.state == "on")) %} input_boolean.turn_on
             {% elif ((states.input_text.lms_p3.state == '') and (states.input_boolean.lms_shuffle.state == "off")) %} input_boolean.turn_off
             {% elif (states.input_text.lms_p3.state == 'on') %} input_boolean.turn_on
             {% elif (states.input_text.lms_p3.state == 'off') %} input_boolean.turn_off
             {% endif %}
      entity_id: input_boolean.lms_shuffle
# Set artist
    - service: input_text.set_value
      data_template:
        entity_id: input_text.lms_artist
        value: "{{lms_artist}}"
# Set album
    - service: input_text.set_value
      data_template:
        entity_id: input_text.lms_album
        value: "{{lms_album}}"
# Set song
    - service: input_text.set_value
      data_template:
        entity_id: input_text.lms_song
        value: "{{lms_song}}"
# Set playlist
    - service: input_text.set_value
      data_template:
        entity_id: input_text.lms_playlist
        value: "{{lms_playlist}}"
### check lms_command and call appropriate script
    - service: script.turn_on
      data_template:
        entity_id: >-
            {% if ((lms_command == "play song") and (states.input_select.lms_source.state == "lms")) %}
              script.lms_cmd_play_song
            {% elif ((lms_command == "play song") and (states.input_select.lms_source.state == "spotify")) %}
              script.lms_cmd_play_song_spot  
            {% elif ((lms_command == "play playlist") and (states.input_select.lms_source.state == "lms")) %}
              script.lms_cmd_play_playlist
            {% elif ((lms_command == "play playlist") and (states.input_select.lms_source.state == "spotify")) %}
              script.lms_cmd_play_playlist_spot
            {% elif ((lms_command == "play artist") and (states.input_select.lms_source.state == "lms")) %}
              script.lms_cmd_play_artist
            {% elif ((lms_command == "play artist") and (states.input_select.lms_source.state == "spotify")) %}
              script.lms_cmd_play_artist_spot
            {% elif ((lms_command == "play album") and (states.input_select.lms_source.state == "lms")) %}
              script.lms_cmd_play_album
            {% elif ((lms_command == "play album") and (states.input_select.lms_source.state == "spotify")) %}
              script.lms_cmd_play_album_spot
            {% else %}
              script.lms_do_nothing
            {% endif %}

As always, any help would be appreciated. Ynot.