Script turns itself off - why?

Configuration
1

Hi, I have this script to turn on TV and play a random episode of a kid’s TV show. For whatever reason, it just turns the TV back off immediately.

alias: Turn on TV and play Cicimys
sequence:
  - service: media_player.turn_on
    target:
      entity_id: media_player.samsungtv
  - delay:
      hours: 0
      minutes: 0
      seconds: 1
      milliseconds: 0
  - service: media_player.shuffle_set
    target:
      entity_id: media_player.libreelec
    data:
      shuffle: true
  - service: media_player.play_media
    data:
      media_content_type: DIRECTORY
      media_content_id: special://profile/playlists/video/CICIMYS.m3u
    target:
      entity_id: media_player.libreelec
  - service: media_player.media_next_track
    target:
      entity_id: media_player.libreelec
  - service: media_player.select_source
    data:
      source: Kodi
    target:
      entity_id: media_player.samsungtv
  - service: media_player.volume_set
    target:
      entity_id: media_player.samsungtv
    data:
      volume_level: 0.09
mode: single
icon: mdi:animation-play

I tried tracing it: I see Turn on TV and play Cicimys (script.turn_on_tv_and_play_cicimys) turned off - what is doing this last step? When I go to “Step details”, the last step is the volume, correct and as expected. Logbook says just “Turn on TV and play Cicimys turned off”.

If I call the script with the TV already turned on, it does not turn the TV off
If I call the script with the TV off, it turns the TV on and then immediately off again.

I have no issues turning the TV on/off from HA/Lovelace or otherwise controlling.

Please help.