yt-dlp now solves YouTube JS challenges via external EJS scripts (yt-dlp-ejs package); a bare PyPI yt-dlp does not include them and remote fetching is disabled by default. Images built after the EJS migration therefore fail every download with HTTP 403 while playlists keep working. Use yt-dlp[default] so the matching yt-dlp-ejs ships in the image, and pass --remote-components ejs:github so solver scripts refresh at runtime when YouTube rotates challenges.
Diane