I got that too like two weeks ago. Updated the “quick fixes” filter list and haven’t seen it since.

Remove your custom rules for youtube. Make sure you don’t have other adblockers such as the one build into the youtube enhancer add-on and if you’re using Firefox, as you should, disable the enhanced tracking protection for youtube (in the address bar) Other than that just make sure you keep uBlock Origin up to date since they update the adblocking detection script atleast twice a day. Just click the clock icon in the “quick fixes” section and click update. No need to update all your filters every time.