hls stream in just_audio is not working with unity3d library

Question

I am using just_audio to play hls-streaming audio and unity3d as a fullscreen background in my flutter Android app (unity3d project has exported as a library with unity-flutter widget). If hls stream is playing without unity or uploaded track is playing with unity - it works fine, sound is playing. When i start hls stream (set HlsAudioSource) with unity widget, unity is shown, but no sound, no errors.

I saw this in logs, when hls stream successfully played without unity:

D/CCodecConfig(27354):   string input.media-type.value = "video/avc"
D/CCodecConfig(27354):   c2::u32 output.delay.value = 12
D/CCodecConfig(27354):   string output.media-type.value = "video/raw"

Does it mean that just_audio runs videoplayer for audio hls stream ? What should i do to play hls stream with just_audio and unity3d in flutter ?

I disabled unity audio, removed all listeners, loaded different tracks for hls stream, tried to configure audio session as AudioSessionConfiguration.music(). It didnt help.