Since the topic is about Blokada Cloud, Private DNS is expected to be configured or Blokada Cloud won’t function.
The advice to disable Private DNS is only relevant for Blokada v5 and older.
It’s a bit confusing, I know 
The latest update on Google Play might resolve the error, we’re still waiting for Google to approve this.
To be able to verify if this is a known issue, please send the logs while referring to this topic.