I have been using latest Safari 14.0.2 on my new macbook since 15 Dec 2020. All seemed ok with ABP for a couple of weeks and then I started seeing all ads on bbc news and youtube. "Allow acceptable ADs" is unchecked. I dont see any other options or controls in the ABP control panel.
I am experiencing similar issues. I would really appreciate if this issue was fixed. Currently, there are ads for me on Youtube (the post-video ones asking you to sign up for a certain advertised service), and on YouTube Music (full video ads).