Issue with Universal Media Player

I’m having problems with Universal Media Player. I think I have it all setup, but I keep getting errors with mute. I get this error:

Failed to call service media_player/volume_mute. required key not provided @ data['is_volume_muted'].

As far as I can tell, my is_volume_muted is working correctly though.

Here’s my config:

media_player:
  platform: universal
  name: Test Universal
  device_class: tv
  children:
    - media_player.sony_xbr_75x90ch
    - media_player.sony_bravia_tv

  commands:
    turn_on:
      service: media_player.turn_on
      data:
        entity_id: media_player.sony_bravia_tv
    turn_off:
      service: media_player.turn_off
      data:
        entity_id: media_player.sony_bravia_tv
    volume_up:
      service: media_player.volume_up
      data:
        entity_id: media_player.sony_bravia_tv
    volume_down:
      service: media_player.volume_down
      data:
        entity_id: media_player.sony_bravia_tv
    volume_mute:
      service: media_player.volume_mute
      data:
        entity_id: media_player.sony_bravia_tv
    select_source:
      service: media_player.select_source
      data:
        entity_id: media_player.sony_bravia_tv
        source: "{{ source }}"
    volume_set:
      service: media_player.volume_set
      data:
        entity_id: media_player.sony_bravia_tv
        volume_level: "{{ volume_level }}"

  attributes:
    state: media_player.sony_bravia_tv
    is_volume_muted: media_player.sony_bravia_tv|is_volume_muted
    volume_level: media_player.sony_bravia_tv|volume_level
    source: media_player.sony_xbr_75x90ch|source
    source_list: media_player.sony_bravia_tv|source_list

When I put this in the Template Editor, I get False for both.

{{ state_attr('media_player.sony_xbr_75x90ch', 'is_volume_muted') }}

{{ state_attr('media_player.test_universal', 'is_volume_muted') }}

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