DynamicChannel doesn't hold any states/is_playing_sound() is always false

[PatrickChodowski]

Version: Bevy 0.15/0.21

I wanted to use dynamic channels to play different sounds like background, walking sounds etc. I use an event to play the sound. Later in the system I am checking if given channel is playing sound and then replace it, if it is.

fn start(
    mut evs:      EventReader<PlaySound>,
    ass:          Res<AssetServer>,
    mut audio:    ResMut<DynamicAudioChannels>,
){  
    for ev in evs.read(){

        let mut audio_to_play: Option<PlayAudioCommand> = None;
        let Some(channel) = audio.get_channel(&ev.channel.to_str()) else {continue;};

        info!("{:?}", channel.states);

        if channel.is_playing_sound() {
            match ev.soundsos {
                SoundSOS::Abandon => {/* Do nothing, there is already a sound in a channel */}
                SoundSOS::Replace => {
                    channel.stop();
                    audio_to_play = Some(channel.play(ass.load(format!("sounds/{}.ogg", ev.sound_name))));
                }
            }
        } else {
            info!("NOT PLAYING SOUND");
            audio_to_play = Some(channel.play(ass.load(format!("sounds/{}.ogg", ev.sound_name))));
        }

....

Turns out the channel.is_playing_sound() returns always false, even though sound is playing (more and more of it :D) I checked the channel.states but they are always empty in this case. I tried to dig deeper but I saw "dyn" and backed off

tools::sounds: ev: PlaySound { channel: AnimationSounds, soundsos: Abandon, playback_rate: 1.0, sound_name: "steps/stepdirt_5", looped: false }
tools::sounds: {}
tools::sounds: NOT PLAYING SOUND
tools::sounds: ev: PlaySound { channel: AnimationSounds, soundsos: Abandon, playback_rate: 1.0, sound_name: "steps/stepdirt_7", looped: false }
tools::sounds: {}
tools::sounds: NOT PLAYING SOUND
tools::sounds: ev: PlaySound { channel: AnimationSounds, soundsos: Abandon, playback_rate: 1.0, sound_name: "steps/stepdirt_8", looped: false }
tools::sounds: {}