Multiple TTS services don't see the language option

I’ve installed the edge TTS custom component (using HACS) and thought I’d setup different services with the ‘languages’ (voices) to make using different voices easier.

What I’ve found though is that calling the different say services will always use the last language (voice). If I pass the language as a parameter to the TTS service, then it works as expected.

My config looks like:

  - platform: edge_tts
    service_name: edge_natasha_say
    language: en-AU-NatashaNeural
    volume: 100.0

  - platform: edge_tts
    service_name: edge_eloise_say
    language: fr-FR-EloiseNeural 
    volume: 100.0

  - platform: edge_tts
    service_name: edge_jorge_say
    language: es-MX-JorgeNeural
    volume: 100.0

  - platform: edge_tts
    service_name: edge_alonso_say
    language: es-US-AlonsoNeural
    volume: 100.0

So if I try this:

service: tts.edge_natasha_say
data:
  entity_id: media_player.playroom_speaker
  message: "Four score and seven years ago our fathers brought forth, upon this continent, a new nation, conceived in liberty, and dedicated to the proposition that all men are created equal."

it sounds like alonso but if I instead use this, I’ll get what I was expecting:

service: tts.edge_aria_say
data:
  entity_id: media_player.playroom_speaker
  message: "Four score and seven years ago our fathers brought forth, upon this continent, a new nation, conceived in liberty, and dedicated to the proposition that all men are created equal."
  language: en-AU-NatashaNeural

Is this an issue with the custom component, my setup (hopefully), or the core TTS?