Unable to download from Youtube Mix

[please55]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.07.28
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Verbose log

    D:\User\Downloads\Youtube-DL>youtube-dl --verbose --extract-audio --audio-format m4a "https://www.youtube.com/watch?v=Sv6nMU9hFuU&list=RDSv6nMU9hFuU"

    [debug] System config: []

    [debug] User config: []

    [debug] Custom config: []

    [debug] Command-line args: ['--verbose', '--extract-audio', '--audio-format', 'm4a', 'https://www.youtube.com
/watch?v=Sv6nMU9hFuU&list=RDSv6nMU9hFuU']

    [debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252

    [debug] youtube-dl version 2020.07.28

    [debug] Python version 3.4.4 (CPython) - Windows-10-10.0.18362

    [debug] exe versions: ffmpeg git-2020-08-18-1c7e55d, ffprobe git-2020-08-18-1c7e55d

    [debug] Proxy map: {}

    [youtube:playlist] Downloading playlist RDSv6nMU9hFuU - add --no-playlist to just download video Sv6nMU9hFuU

    [youtube:playlist] RDSv6nMU9hFuU: Downloading page 1 of Youtube mix

    [download] Downloading playlist: RDSv6nMU9hFuU

    [youtube:playlist] playlist RDSv6nMU9hFuU: Collected 0 video ids (downloading 0 of them)

    [download] Finished downloading playlist: RDSv6nMU9hFuU

Description

This is not the typical youtube user playlist but what's known as a 'Youtube Mix'. Is this an issue or a feature that's simply not supported?