Can any of you with a RSS feed Xwidget please test this RSS URL?
https://www.youtube.com/feeds/videos.xm ... d_lH_MUKggIt is just an RSS feed from youtube to any channel id. The id is UCjgS6Uyg8ok4Jd_lH_MUKgg and can be replaced by any other channel ID. You obtain this by looking at the page source of any youtube channel page and searching for the channel ID.
I find that Xwidget cannot display a youtube RSS feed no matter what the channel ID. Other RSS feeds can display youtube RSS feeds perfectly well.
I think this is an xwidget RSS core bug - anyone reading this - please test and confirm.