Blacklisted facebook and still has connections

Hi everyone!

But today I have a problem. On my Android phone (MIUI 12, Android 10) I only have WhatsApp installed from Facebook (no Instagram, no Facebook, no Messenger). NextDNS blocks privatestats.whatsapp.net, and also graph.facebook.com, because Tricount (an app for expenses) has it.

But suddenly, a week ago,with no changes on the apps installed or in my use of the phone, appears two new domains: mqtt-mini.facebook.com & www.facebook.com. I guess that it's also tracking, because I don't use Facebook and it's weird that every 5-10 minutes, even with the phone locked, makes a petition to that domains.

I put both domains on the blacklist, but even with that, NextDNS isn't blocking anything. I tried to enter facebook.com on my Firefox for Android, and I could with any trouble.

https://imgur.com/a/IWck1GU -> Screenshots

My list: NextDNS list, oisd, Goodbye Ads, 1Hosts (Lite) and Steven Black. All working with no issues from the beginning.

I also tried to block Facebook through Parental Control (deleting domains from blacklist just in case), but doesn't work. It makes the petition with any blocks. I also tried to access Facebook's website through Chrome (first use) and downloaded Brave just for this, no config, and also I could access to the website.

I'm run out of ideas (and also blaming at Facebook).

Cheers.