The past week or so (maybe since January 1?) I have a persistent notification for a new souvenir. I can view my souvenirs, it goes away, but within half an hour, it's back. I look at them again, the notification goes away, and then returns. The last souvenir I earned is the one for Jan 1. I've restarted the app, and the phone, and the behavior remains.
Android v. 9
App v. 7.2.0
Google Pixel
How can I clear this?