Here's the test RSS URL
https://www.youtube.com/feeds/videos.xml?playlist_id=PLrOH7T36QRfWxFW5UwhX3o3MZab1HZb_c
Here the permalink, in case the author changes the title
https://files.catbox.moe/5hwyhp.xml
When Elfeed attempts to read the entry, it says
[2025-11-22 12:58:27] [error]: https://www.youtube.com/feeds/videos.xml?playlist_id=PLrOH7T36QRfWxFW5UwhX3o3MZab1HZb_c: (error XML: (Not Well-Formed) Invalid entity reference)
The entry title contains &. When I create a copy of this RSS file without the & (changing nothing else) and feed it into Elfeed, it works as expected.