Youtube Mix Playlist: Collected 0 video ids

[aciidic]

Working inconsistently on some Youtube mix playlists (autogenerated by Youtube)

OK:
(normal playlist)
https://www.youtube.com/watch?v=cmSbXsFE3l8&list=PLyfE3pnEkrBMiCPLNDhft9hmeXK1wtkGF
(mix playlist)
https://www.youtube.com/watch?v=q0hyYWKXF0Q&list=RDCLAK5uy_mkLtojKLOUUGwnu3ZnN5AaODijlieB-aQ&start_radio=1

Not working:
(mix playlist)
https://www.youtube.com/watch?v=btGjFzQ5_-A&list=RDbtGjFzQ5_-A&start_radio=1

If I add --flat-playlist script bombs out at [debug] Proxy map: {} with no message

root@server:~# python3 /root/youtube-dl -v -i "https://www.youtube.com/watch?v=btGjFzQ5_-A&list=RDbtGjFzQ5_-A&start_radio=1"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '-i', 'https://www.youtube.com/watch?v=btGjFzQ5_-A&list=RDbtGjFzQ5_-A&start_radio=1']
WARNING: Assuming --restrict-filenames since file system encoding cannot encode all characters. Set the LC_ALL environment variable to fix this.
[debug] Encodings: locale ANSI_X3.4-1968, fs ascii, out ANSI_X3.4-1968, pref ANSI_X3.4-1968
[debug] youtube-dl version 2019.11.05
[debug] Python version 3.5.3 (CPython) - Linux-2.6.32-042stab127.2-x86_64-with-debian-9.11
[debug] exe versions: none
[debug] Proxy map: {}
[youtube:playlist] Downloading playlist RDbtGjFzQ5_-A - add --no-playlist to just download video btGjFzQ5_-A
[youtube:playlist] RDbtGjFzQ5_-A: Downloading page 1 of Youtube mix
[download] Downloading playlist: Category
[youtube:playlist] playlist Category: Collected 0 video ids (downloading 0 of them)
[download] Finished downloading playlist: Category

Any thoughts?

[remitamine]

python __main__.py -i 'https://www.youtube.com/watch?v=btGjFzQ5_-A&list=RDbtGjFzQ5_-A&start_radio=1'
[youtube:playlist] Downloading playlist RDbtGjFzQ5_-A - add --no-playlist to just download video btGjFzQ5_-A
[youtube:playlist] RDbtGjFzQ5_-A: Downloading page 1 of Youtube mix
[youtube:playlist] RDbtGjFzQ5_-A: Downloading page 2 of Youtube mix
[youtube:playlist] RDbtGjFzQ5_-A: Downloading page 3 of Youtube mix
[youtube:playlist] RDbtGjFzQ5_-A: Downloading page 4 of Youtube mix
[youtube:playlist] RDbtGjFzQ5_-A: Downloading page 5 of Youtube mix
[youtube:playlist] RDbtGjFzQ5_-A: Downloading page 6 of Youtube mix
[youtube:playlist] RDbtGjFzQ5_-A: Downloading page 7 of Youtube mix
[youtube:playlist] RDbtGjFzQ5_-A: Downloading page 8 of Youtube mix
[youtube:playlist] RDbtGjFzQ5_-A: Downloading page 9 of Youtube mix
[youtube:playlist] RDbtGjFzQ5_-A: Downloading page 10 of Youtube mix
[youtube:playlist] RDbtGjFzQ5_-A: Downloading page 11 of Youtube mix
[youtube:playlist] RDbtGjFzQ5_-A: Downloading page 12 of Youtube mix
[youtube:playlist] RDbtGjFzQ5_-A: Downloading page 13 of Youtube mix
[youtube:playlist] RDbtGjFzQ5_-A: Downloading page 14 of Youtube mix
[youtube:playlist] RDbtGjFzQ5_-A: Downloading page 15 of Youtube mix
[youtube:playlist] RDbtGjFzQ5_-A: Downloading page 16 of Youtube mix
[download] Downloading playlist: Mix - Ms. Dynamite - Dy-Na-Mi-Tee
[youtube:playlist] playlist Mix - Ms. Dynamite - Dy-Na-Mi-Tee: Collected 349 video ids (downloading 349 of them)
[download] Downloading video 1 of 349
[youtube] btGjFzQ5_-A: Downloading webpage
...

[celloh123]

also having the same problem with the smoothest of smooth jazz playlist mix

[Traxxel]

Same here (and also, if v=... is left blank):
youtube-dl --extract-audio --audio-format mp3 --audio-quality 0 --write-thumbnail "https://www.youtube.com/watch?v=VoAIaAwVk4U&list=RD8hOa633MGno"

[youtube:playlist] Downloading playlist RD8hOa633MGno - add --no-playlist to just download video VoAIaAwVk4U
[youtube:playlist] RD8hOa633MGno: Downloading page 1 of Youtube mix
[download] Downloading playlist: RD8hOa633MGno
[youtube:playlist] playlist RD8hOa633MGno: Collected 0 video ids (downloading 0 of them)
[download] Finished downloading playlist: RD8hOa633MGno

[kingcocomango]

You might not have been able to recreate it because this playlist is an automatically generated one?
https://www.youtube.com/watch?v=JIZ2YRbrCwg&list=RDJIZ2YRbrCwg&start_radio=1