I have the same problem. Blokada in version 5.4 does not block advertising since a few days. I was wondering if I did something different. The only thing I did: I tried the DNS server of Blokada. Since then the app does not block advertising with other DNS servers. When I switch back to Blokada DNS everything works again. I think version 5.4 has a problem with the DNS? Especially the DNS of Blokada?