Yahoo Mail now consistently flags forwarded emails from @duck address as spam

I signed up for a duck privacy address the day they were announced and had the address for forwarding set to my Yahoo mail (my primary, and the only one I ever actually check)

I noticed recently that ALL emails that get forwarded from the duck address are being marked as spam by Yahoo. This is fine when I'm expecting the email, but I get hundreds of spam emails a day and there is no tool for searching within the spam folder.

Does anyone have a solution for this or is yahoo just permenantly shafting me for having the audacity to value my privacy?