[youtube] no videos returned when downloading playlist

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2021.12.17
• 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 "https://www.youtube.com/playlist?list=PLR-K8lW4EfsLJOA_JkaYQzogjprWJXsVL"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://www.youtube.com/playlist?list=PLR-K8lW4EfsLJOA_JkaYQzogjprWJXsVL']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2025.11.26 [956b8c585] (single file build)
[debug] ** This version was built from the latest master code at https://github.com/ytdl-org/youtube-dl.
[debug] ** For support, visit the main site.
[debug] Python 3.4.4 (CPython AMD64 32bit) - Windows-10-10.0.26100 - OpenSSL 1.0.2d 9 Jul 2015
[debug] exe versions: ffmpeg n5.1.6-9-gdcdfd7fb62-20241109, ffprobe n5.1.6-9-gdcdfd7fb62-20241109
[debug] Proxy map: {}
[youtube:tab] PLR-K8lW4EfsLJOA_JkaYQzogjprWJXsVL: Downloading webpage
[download] Downloading playlist: Patrick for 10 hours
[youtube:tab] playlist Patrick for 10 hours: Downloading 0 videos
[download] Finished downloading playlist: Patrick for 10 hours

Description

Playlists return no videos now. Started happening intermittently maybe a month ago but only yesterday all requests failed. I guess it was a slow feature roll-out and something changed in the playlist page.