I upgraded to Sequoia on MacBook M1. None of the emails from The Guardian, New York Times, The Economist, Houston Chronicle, the atlantic are being delivered. I check block list and find nothing to stop these.
SpamSieve doesn’t prevent messages from being delivered. It just moves the spam ones from Inbox to Junk. You can see all the messages that SpamSieve has processed in the Log window. If the message are not listed there, perhaps they were blocked by a server junk filter instead.