Strange sound if a sentence ends with punctuation

[jhemak]

Hello, after upgrading from 1.6.4 to 2.1.1, I have noticed a new, very strange sound produced by piper at the end of spoken text.

To reproduce, use something like:

action: media_player.play_media
data:
  announce: true
  extra:
    volume: 40
  media:
    media_content_id: media-source://tts/tts.piper?message="This is a test."
    media_content_type: music
    metadata: {}
target:
  entity_id: media_player.xxxxxx

You should hear "This is a test" followed by a strange, low sound. If you use the following, you will hear only "This is a test", as expected.

action: media_player.play_media
data:
  announce: true
  extra:
    volume: 40
  media:
    media_content_id: media-source://tts/tts.piper?message="This is a test"
    media_content_type: music
    metadata: {}
target:
  entity_id: media_player.xxxxxx

This problem is not present when using tts.speak. It is also not present when using the first action above while running version 1.6.4 of the Piper Add On for Home Assistant. It is reproducable on 1.6.4 using the first Action with a ! instead of a . at the end of the phrase.

Thanks in advance for investigating if you are able!