How do I use the AudioServer.capture_set_device() ? Maybe a Bug?

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:bust_in_silhouette: Asked By Gamemap

In my code I have the following:
AudioServer.capture_set_device("Stereo Mix")
In the Output it says:
[Default, Stereo Mix (Realtek High Definition Audio), Microphone (Realtek High Definition Audio)] Default

This didn’t worked also:
AudioServer.capture_set_device("Stereo Mix (Realtek High Definition Audio)")

Stereo Mix is enabled.
Do I make something wrong or is it a bug?