Running a script from script editor sometimes shows popup for field values, and sometimes it doesn't

I have a script that has some fields. When I run the script from the script editor, sometimes it asks me for the field values, and sometimes it doesn’t. I cannot figure out why.

This is what I see when it does prompt for field values.

Below is my script YAML:

alias: TTS To Idle Google Speakers and Phones
description: >-
  This script will send a message to idle Google Home speakers (with an optional
  speaker filter) and to mobile phones.
fields:
  message:
    name: Message
    description: The message to announce
    required: true
    selector:
      text: null
  label:
    selector:
      select:
        options:
          - house alert L1
          - house alert L2
          - house alert L3
    default: house alert L1
    required: true
sequence:
  - variables:
      tts_message: "{{ message }}"
      label_filter: "{{ label | default('', true) | lower | replace(' ', '_') }}"
      idle_matched_speakers: >
        {% set matched = namespace(speakers=[]) %} {% for entity in
        states.media_player %}
          {% set is_speaker = entity.attributes.device_class == 'speaker' %}
          {% set is_idle = entity.state in ['idle', 'paused', 'off'] %}
          {% set dev_id = device_attr(entity.entity_id, 'id') %}
          {% set dev_labels = labels(dev_id) %}
          {% set label_matches = (label_filter == '') or (label_filter in dev_labels | map('lower') | list) %}
          {% if is_speaker and is_idle and label_matches %}
            {% set matched.speakers = matched.speakers + [entity.entity_id] %}
          {% endif %}
        {% endfor %} {{ matched.speakers }}
  - condition: template
    value_template: "{{ idle_matched_speakers | length > 0 }}"
    enabled: true
  - repeat:
      for_each: "{{ idle_matched_speakers }}"
      sequence:
        - action: media_player.volume_set
          metadata: {}
          data:
            volume_level: 0.6
          target:
            entity_id: "{{ repeat.item }}"
        - action: tts.speak
          metadata: {}
          data:
            cache: true
            media_player_entity_id: "{{ repeat.item }}"
            message: "{{ tts_message }}"
          target:
            entity_id: tts.google_en_com
          enabled: true
    enabled: true
  - delay:
      hours: 0
      minutes: 0
      seconds: 10
      milliseconds: 0
    enabled: true
  - repeat:
      for_each: "{{ idle_matched_speakers }}"
      sequence:
        - action: media_player.volume_set
          metadata: {}
          data:
            volume_level: 0.4
          target:
            entity_id: "{{ repeat.item }}"
        - action: media_player.turn_off
          metadata: {}
          data: {}
          target:
            entity_id: "{{ repeat.item }}"
          enabled: true
    enabled: true
  - action: notify.notify
    data:
      title: Home Assistant Alert
      message: "{{ tts_message }}"
mode: restart