Youtube Music Mixes not downloading correctly

[gnations56]

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

youtube-dl -v --download-archive downloaded.txt -x --audio-format mp3 -o "%(artist)s/%(album)s/%(title)s.%(ext)s" "https://m
usic.youtube.com/playlist?list=RDCLAK5uy_kx0d2-VPr69KAkIQOTVFq04hCBsJE9LaI&feature=share&playnext=1"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '--download-archive', 'downloaded.txt', '-x', '--audio-format', 'mp3', '-o', '%(artist)s/%(album)s/%(title)s.%(ext)s', 'https://music.youtube.com/playlist
?list=RDCLAK5uy_kx0d2-VPr69KAkIQOTVFq04hCBsJE9LaI&feature=share&playnext=1']
[debug] Encodings: locale cp1252, fs utf-8, out utf-8, pref cp1252
[debug] youtube-dl version 2020.07.28
[debug] Python version 3.8.5 (CPython) - Windows-10-10.0.19041-SP0
[debug] exe versions: ffmpeg 4.3.1, ffprobe 4.3.1
[debug] Proxy map: {}
[youtube:playlist] RDCLAK5uy_kx0d2-VPr69KAkIQOTVFq04hCBsJE9LaI: Downloading page 1 of Youtube mix
[download] Downloading playlist: RDCLAK5uy_kx0d2-VPr69KAkIQOTVFq04hCBsJE9LaI
[youtube:playlist] playlist RDCLAK5uy_kx0d2-VPr69KAkIQOTVFq04hCBsJE9LaI: Collected 0 video ids (downloading 0 of them)
[download] Finished downloading playlist: RDCLAK5uy_kx0d2-VPr69KAkIQOTVFq04hCBsJE9LaI

Description

When I try to download a mix from youtube music, youtube-dl finds no videos. The link below works fine in the browser
https://music.youtube.com/playlist?list=RDCLAK5uy_k27uu-EtQ_b5U2r26DNDZOmNqGdccUIGQ

[bubbleguuum]

That supposed fix (after patching youtube.py) does not work for me, with "https://m
usic.youtube.com/playlist?list=some_playlist_id&feature=share&playnext=1" style URLs, with 0 items always returned in the resulting Playlist.

[W4lv1s]

Doesn't work for me either.
Command

youtube-dl -i --audio-format=mp3 https://www.youtube.com/playlist?list=RDI85acNP2egM -vv

Verbose Output:
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'-i', u'--audio-format=mp3', u'https://www.youtube.com/playlist?list=RDI85acNP2egM', u'-vv']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.09.14
[debug] Python version 2.7.15 (CPython) - Darwin-17.7.0-x86_64-i386-64bit
[debug] exe versions: avconv 12.3, avprobe 12.3, ffmpeg 3.4.2, ffprobe 3.4.2, rtmpdump 2.4
[debug] Proxy map: {}
[youtube:playlist] RDI85acNP2egM: Downloading page 1 of Youtube mix
[download] Downloading playlist: RDI85acNP2egM
[youtube:playlist] playlist RDI85acNP2egM: Collected 0 video ids (downloading 0 of them)
[download] Finished downloading playlist: RDI85acNP2egM

Playlist/mix works fine in a browser

[Kite1024]

Experiencing the same issue: Command+Output:

youtube-dl.exe -f bestaudio RDY1Bx0b0394M --verbose
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-f', 'bestaudio', 'RDY1Bx0b0394M', '--verbose']
[debug] Encodings: locale cp1252, fs mbcs, out cp1252, pref cp1252
[debug] youtube-dl version 2020.09.20
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.18362
[debug] exe versions: ffmpeg git-2020-08-12-bb59bdb, ffprobe git-2020-08-12-bb59bdb
[debug] Proxy map: {}
[youtube:playlist] RDY1Bx0b0394M: Downloading page 1 of Youtube mix
[download] Downloading playlist: RDY1Bx0b0394M
[youtube:playlist] playlist RDY1Bx0b0394M: Collected 0 video ids (downloading 0 of them)
[download] Finished downloading playlist: RDY1Bx0b0394M

---

The issue is specifically with youtube-mixes, have not had an issue with other playlists so far.

I noticed I am unable to visit the mix posted by W4lv1s, so I though maybe it's a session issue. So I have also tried using the cookies from the session where the mix was made but to no avail. (output below)

---

youtube-dl.exe --cookies cookies.txt -f bestaudio RDY1Bx0b0394M --verbose
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--cookies', 'cookies.txt', '-f', 'bestaudio', 'RDY1Bx0b0394M', '--verbose']
[debug] Encodings: locale cp1252, fs mbcs, out cp1252, pref cp1252
[debug] youtube-dl version 2020.09.20
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.18362
[debug] exe versions: ffmpeg git-2020-08-12-bb59bdb, ffprobe git-2020-08-12-bb59bdb
[debug] Proxy map: {}
[youtube:playlist] RDY1Bx0b0394M: Downloading page 1 of Youtube mix
[download] Downloading playlist: RDY1Bx0b0394M
[youtube:playlist] playlist RDY1Bx0b0394M: Collected 0 video ids (downloading 0 of them)
[download] Finished downloading playlist: RDY1Bx0b0394M