Blocked app downloading data

I did read here that some blocked apps can download data using Play Store or some other ad method to bypass the firewall. I wanted to check my understanding on this.

I notice an app I have not used for a while downloaded 8 meg today even though it is blocked and I have not opened it. The same app shows up frequently. There are some other blocked apps that have also downloaded data but not nearly that amount and 8 megs seems like a lot. Can anyone verify this bypass is what’s happening or provide another reason?

Pixel3a with paid GW 3.0.380r