AudioStreamPlayer doesn't emit its finished() signal after playing a stream from an Audio Playback track

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i think many has encountered this issue, one of the answer is here

AudioStreamPlayer not emitting finished()

There are a few outstanding issues with AudioStreamPlayer and finished(). Possibly you experience one of them. See for example AudioStreamPlayer does not call "finished" signal · Issue #87802 · godotengine/godot · GitHub

you can also just await the length of the audio to know it’s already finished. something like

await get_tree().create_timer(audio.get_length() + .1).timeout

the audio is AudioStream type which is used to play in audio stream player