Without being logged on to Facebook, I’ve opened https://www.facebook.com/Giornalettismo in a private window. Shields doesn’t block anything, but the page is blocked: no scrollbars, no notices from FB.
No, some pages work (for example facebook.com/BraveBrowser). I don’t know what kind of element triggers the block; however, like I said, it definitely depends on Fanboy Annoyances List, because the problem goes away when I uncheck that list.
At the moment I’m using a mobile phone, so I can’t try uBlock Origin, but I remember that when I had uBlock Origin + Brave for Windows, I had to disable cosmetic filtering in uBO for the facebook.com domain, otherwise the scrollbar disappeared and the pages were blocked.