I installed minminguard because of your comment, but I canβt see it is helping at all, I had AdAway rooted version before so I never saw ads but the empty squares.
Minminguard is an xposed module that I run via lsposed (xposed development halted, lsposed is a magisk module that needs you to activate minminguard for the app. (and then in minminguard either add the app to the blacklist or use the whitelist and don't add it there) It's a lot of hoops you need to jump trough.
However, the empty squares stay even with minminguard, as the app uses the same 'message block' for posts and ads. (at least that's how it looks) WIth both running, it could well be possible that adaway already filtered before minminguard. Here it also showed 0 ads blocked (no other ad blocker), but I saw already several empty ad blocks. (so that counter isn't to accurate) You could try with adaway temporary disabled to see what it does (and check if you missed one of the hoops).