Try adding this to your user filter until 5.10 is released with the Polish filters (and they can be updated).
---------- Post added at 01:06 PM ---------- Previous post was at 12:52 PM ----------
That rule won't work and I know why. For some reason element hiding for that domain is whitelisted in EasyList. To get filtering working correctly open Adguard, go to the Settings > Ad Blocker section and from the dropdown menu select the English filter (or whatever filter you're using). Then search for @@||tvn24.pl^$elemhide and uncheck that rule. Filtering will work correctly then. Apparently that rule is to fix video playback on that site, so it *may* not work correctly and you may have to end up having to compromise between ad filtering and being able to watch videos.